Index: wp-includes/category-template.php
===================================================================
--- wp-includes/category-template.php	(revision 16394)
+++ wp-includes/category-template.php	(working copy)
@@ -66,9 +66,13 @@
 function get_the_category( $id = false ) {
 	$categories = get_the_terms( $id, 'category' );
 
+	if ( ! $categories )
+		$categories = array();
+
 	foreach ( array_keys( (array) $categories ) as $key ) {
 		_make_cat_compat( $categories[$key] );
 	}
+
 	// Filter name is plural because we are return alot of categories not just one
 	return apply_filters( 'get_the_categories', $categories );
 }