Ticket #15407: 15407.fix-for-no-category-posts-fatal-error.patch

wp-includes/category-template.php

@@ -66 +66 @@
 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 );
 }