Index: wp-admin/edit-category-form.php
===================================================================
--- wp-admin/edit-category-form.php	(revision 6574)
+++ wp-admin/edit-category-form.php	(working copy)
@@ -5,14 +5,14 @@
 	$form = '<form name="editcat" id="editcat" method="post" action="categories.php">';
 	$action = 'editedcat';
 	$nonce_action = 'update-category_' . $cat_ID;
-	do_action('edit_category_form_pre', $category);
+	do_action('edit_category_form_pre', ( isset($category) ) ? $category : null);
 } else {
 	$heading = __('Add Category');
 	$submit_text = __('Add Category &raquo;');
 	$form = '<form name="addcat" id="addcat" method="post" action="categories.php" class="add:the-list:">';
 	$action = 'addcat';
 	$nonce_action = 'add-category';
-	do_action('add_category_form_pre', $category);
+	do_action('add_category_form_pre', ( isset($category) ) ? $category : null);
 }
 ?>
 
@@ -20,30 +20,31 @@
 <h2><?php echo $heading ?></h2>
 <div id="ajax-response"></div>
 <?php echo $form ?>
-<input type="hidden" name="action" value="<?php echo $action ?>" />
-<input type="hidden" name="cat_ID" value="<?php echo $category->term_id ?>" />
+<input type="hidden" name="action" value="<?php echo ( isset($action) ) ? $action : '' ?>" />
+<input type="hidden" name="cat_ID" value="<?php echo ( isset($category->term_id) ) ? $category->term_id : ''?>" />
 <?php wp_nonce_field($nonce_action); ?>
 	<table class="editform" width="100%" cellspacing="2" cellpadding="5">
 		<tr class="form-field form-required">
 			<th width="33%" scope="row" valign="top"><label for="cat_name"><?php _e('Category name:') ?></label></th>
-			<td width="67%"><input name="cat_name" id="cat_name" type="text" value="<?php echo attribute_escape($category->name); ?>" size="40" /></td>
+			<td width="67%"><input name="cat_name" id="cat_name" type="text" value="<?php echo ( isset($category->name) ) ? attribute_escape($category->name) : ''; ?>" size="40" /></td>
 		</tr>
 		<tr class="form-field">
 			<th scope="row" valign="top"><label for="category_nicename"><?php _e('Category slug:') ?></label></th>
-			<td><input name="category_nicename" id="category_nicename" type="text" value="<?php echo attribute_escape($category->slug); ?>" size="40" /></td>
+			<td><input name="category_nicename" id="category_nicename" type="text" value="<?php echo ( isset($category->attribute_escape) ) ? attribute_escape($category->slug) : ''; ?>" size="40" /></td>
 		</tr>
 		<tr class="form-field">
 			<th scope="row" valign="top"><label for="category_parent"><?php _e('Category parent:') ?></label></th>
 			<td>
-	  			<?php wp_dropdown_categories('hide_empty=0&name=category_parent&orderby=name&selected=' . $category->parent . '&hierarchical=1&show_option_none=' . __('None')); ?>
+	  			<?php $parent = ( isset($category->parent) ) ? $category->parent : '';
+				wp_dropdown_categories('hide_empty=0&name=category_parent&orderby=name&selected=' . $parent . '&hierarchical=1&show_option_none=' . __('None')); ?>
 	  		</td>
 		</tr>
 		<tr class="form-field">
 			<th scope="row" valign="top"><label for="category_description"><?php _e('Description: (optional)') ?></label></th>
-			<td><textarea name="category_description" id="category_description" rows="5" cols="50" style="width: 97%;"><?php echo wp_specialchars($category->description); ?></textarea></td>
+			<td><textarea name="category_description" id="category_description" rows="5" cols="50" style="width: 97%;"><?php echo ( isset($category->description) ) ? wp_specialchars($category->description) : ''; ?></textarea></td>
 		</tr>
 	</table>
 <p class="submit"><input type="submit" name="submit" value="<?php echo $submit_text ?>" /></p>
-<?php do_action('edit_category_form', $category); ?>
+<?php do_action('edit_category_form', ( isset($category) ) ? $category : null); ?>
 </form>
 </div>