Fix #1184 Fix issue with using a multiple taxonomy filter of which on…

…e had no results

If there are 2+ taxonomies required but one has 0 items, it was just
picking the ones corresponding to the other taxonomy, thus generating a
wrong result. Adding an empty array will later make array_intersect_key
generate an empty array if the operation is `and`

CHANGELOG.md

@@ -11,6 +11,7 @@
     * Synced `webserver-configs/htaccess.txt` with `.htaccess`
  1. [](#bugfix)
     * Fix page collections problem with `@page.modular` [#1178](https://github.com/getgrav/grav/pull/1178)
+    * Fix issue with using a multiple taxonomy filter of which one had no results [#1184](https://github.com/getgrav/grav/issues/1184)
 
 # v1.1.9-rc.2
 ## 11/26/2016

system/src/Grav/Common/Taxonomy.php

@@ -93,6 +93,8 @@ public function findTaxonomy($taxonomies, $operator = 'and')
             foreach ((array)$items as $item) {
                 if (isset($this->taxonomy_map[$taxonomy][$item])) {
                     $matches[] = $this->taxonomy_map[$taxonomy][$item];
+                } else {
+                    $matches[] = [];
                 }
             }
         }
@@ -126,7 +128,7 @@ public function taxonomy($var = null)
 
         return $this->taxonomy_map;
     }
-    
+
     /**
      * Gets item keys per taxonomy
      *