fix on delete initiative without city

Author: augusthur

src/Resource/InitiativeResource.php

@@ -204,7 +204,7 @@ public function deleteInitiative($subject, $iniId, $options = [], $flags = 3)
         }
         $city = $init->city;
         $deleted = $init->delete();
-        if ($deleted) {
+        if (isset($city) && $deleted) {
             $city->decrement('initiatives_count');
             if ($city->initiatives_count == 0) {
                 $city->delete();