Fix bug in id supression implementation

cdplib/db_handlers/MongodbHandler.py

@@ -253,9 +253,9 @@ class MongodbHandler:
         '''
         try:
             if attribute == None or attribute_value == None:
-                data = self._database[collection_name].find({'_id': return_id})
+                data = self._database[collection_name].find({},{'_id': return_id})
             else:
-                data = self._database[collection_name].find({attribute: {comparison_operator: attribute_value}, {'_id': return_id}})
+                data = self._database[collection_name].find({attribute: {comparison_operator: attribute_value}}, {'_id': return_id})
 
         except Exception as error:
             self._log.log_and_raise_error(('An error occured trying to query data from {}, with query {}: {}:{}. \nError:{}').format(collection_name, attribute, comparison_operator, attribute_value, error))