Index: src/wp-admin/includes/image.php
===================================================================
--- src/wp-admin/includes/image.php	(revision 32542)
+++ src/wp-admin/includes/image.php	(working copy)
@@ -190,8 +190,7 @@
 	}
 
 	// Remove the blob of binary data from the array.
-	if ( isset( $metadata['image']['data'] ) )
-		unset( $metadata['image']['data'] );
+	unset( $metadata['image']['data'] );
 
 	/**
 	 * Filter the generated attachment meta data.
Index: src/wp-admin/includes/media.php
===================================================================
--- src/wp-admin/includes/media.php	(revision 32542)
+++ src/wp-admin/includes/media.php	(working copy)
@@ -355,8 +355,7 @@
 	), $post_data );
 
 	// This should never be set as it would then overwrite an existing attachment.
-	if ( isset( $attachment['ID'] ) )
-		unset( $attachment['ID'] );
+	unset( $attachment['ID'] );
 
 	// Save the data
 	$id = wp_insert_attachment($attachment, $file, $post_id);
@@ -419,8 +418,7 @@
 	), $post_data );
 
 	// This should never be set as it would then overwrite an existing attachment.
-	if ( isset( $attachment['ID'] ) )
-		unset( $attachment['ID'] );
+	unset( $attachment['ID'] );
 
 	// Save the attachment metadata
 	$id = wp_insert_attachment($attachment, $file, $post_id);
Index: src/wp-admin/includes/nav-menu.php
===================================================================
--- src/wp-admin/includes/nav-menu.php	(revision 32542)
+++ src/wp-admin/includes/nav-menu.php	(working copy)
@@ -1280,10 +1280,11 @@
 
 			$menu_item_db_id = wp_update_nav_menu_item( $nav_menu_selected_id, ( $_POST['menu-item-db-id'][$_key] != $_key ? 0 : $_key ), $args );
 
-			if ( is_wp_error( $menu_item_db_id ) )
+			if ( is_wp_error( $menu_item_db_id ) ) {
 				$messages[] = '<div id="message" class="error"><p>' . $menu_item_db_id->get_error_message() . '</p></div>';
-			elseif ( isset( $menu_items[$menu_item_db_id] ) )
-				unset( $menu_items[$menu_item_db_id] );
+			} else {
+				unset( $menu_items[ $menu_item_db_id ] );
+			}
 		}
 	}
 
Index: src/wp-includes/class-wp-embed.php
===================================================================
--- src/wp-includes/class-wp-embed.php	(revision 32544)
+++ src/wp-includes/class-wp-embed.php	(working copy)
@@ -109,8 +109,7 @@
 	 * @param int $priority Optional. The priority of the handler to be removed (default: 10).
 	 */
 	public function unregister_handler( $id, $priority = 10 ) {
-		if ( isset($this->handlers[$priority][$id]) )
-			unset($this->handlers[$priority][$id]);
+		unset( $this->handlers[ $priority ][ $id ] );
 	}
 
 	/**
Index: src/wp-includes/class-wp-walker.php
===================================================================
--- src/wp-includes/class-wp-walker.php	(revision 32542)
+++ src/wp-includes/class-wp-walker.php	(working copy)
@@ -408,9 +408,7 @@
 			foreach ( (array) $children_elements[$id] as $child )
 				$this->unset_children( $child, $children_elements );
 
-		if ( isset($children_elements[$id]) )
-			unset( $children_elements[$id] );
-
+		unset( $children_elements[ $id ] );
 	}
 
 } // Walker
Index: src/wp-includes/general-template.php
===================================================================
--- src/wp-includes/general-template.php	(revision 32542)
+++ src/wp-includes/general-template.php	(working copy)
@@ -2668,9 +2668,7 @@
 
 		// Remove the format argument from the array of query arguments, to avoid overwriting custom format.
 		foreach ( $format_args as $format_arg => $format_arg_value ) {
-			if ( isset( $url_query_args[ $format_arg ] ) ) {
-				unset( $url_query_args[ $format_arg ] );
-			}
+			unset( $url_query_args[ $format_arg ] );
 		}
 
 		$args['add_args'] = array_merge( $args['add_args'], urlencode_deep( $url_query_args ) );
Index: src/wp-includes/plugin.php
===================================================================
--- src/wp-includes/plugin.php	(revision 32542)
+++ src/wp-includes/plugin.php	(working copy)
@@ -332,9 +332,7 @@
 		}
 	}
 
-	if ( isset( $merged_filters[ $tag ] ) ) {
-		unset( $merged_filters[ $tag ] );
-	}
+	unset( $merged_filters[ $tag ] );
 
 	return true;
 }
Index: src/wp-includes/post.php
===================================================================
--- src/wp-includes/post.php	(revision 32542)
+++ src/wp-includes/post.php	(working copy)
@@ -1755,8 +1755,7 @@
 function remove_post_type_support( $post_type, $feature ) {
 	global $_wp_post_type_features;
 
-	if ( isset( $_wp_post_type_features[$post_type][$feature] ) )
-		unset( $_wp_post_type_features[$post_type][$feature] );
+	unset( $_wp_post_type_features[ $post_type ][ $feature ] );
 }
 
 /**
Index: src/wp-includes/widgets.php
===================================================================
--- src/wp-includes/widgets.php	(revision 32542)
+++ src/wp-includes/widgets.php	(working copy)
@@ -569,8 +569,7 @@
 	 * @param string $widget_class The name of a {@see WP_Widget} subclass.
 	 */
 	public function unregister( $widget_class ) {
-		if ( isset($this->widgets[$widget_class]) )
-			unset($this->widgets[$widget_class]);
+		unset( $this->widgets[ $widget_class ] );
 	}
 
 	/**
@@ -851,8 +850,7 @@
 function unregister_sidebar( $name ) {
 	global $wp_registered_sidebars;
 
-	if ( isset( $wp_registered_sidebars[$name] ) )
-		unset( $wp_registered_sidebars[$name] );
+	unset( $wp_registered_sidebars[ $name ] );
 }
 
 /**
@@ -893,12 +891,8 @@
 
 	$id_base = _get_widget_id_base($id);
 	if ( in_array($output_callback, $_wp_deprecated_widgets_callbacks, true) && !is_callable($output_callback) ) {
-		if ( isset($wp_registered_widget_controls[$id]) )
-			unset($wp_registered_widget_controls[$id]);
-
-		if ( isset($wp_registered_widget_updates[$id_base]) )
-			unset($wp_registered_widget_updates[$id_base]);
-
+		unset( $wp_registered_widget_controls[ $id ] );
+		unset( $wp_registered_widget_updates[ $id_base ] );
 		return;
 	}
 
@@ -1024,9 +1018,7 @@
 	}
 
 	if ( in_array($control_callback, $_wp_deprecated_widgets_callbacks, true) && !is_callable($control_callback) ) {
-		if ( isset($wp_registered_widgets[$id]) )
-			unset($wp_registered_widgets[$id]);
-
+		unset( $wp_registered_widgets[ $id ] );
 		return;
 	}