query_handler_improvements

Signed-off-by: hwassman <[email protected]>

Author: Helene

source/queryHandler/QueryHandler.py

@@ -165,9 +165,10 @@ def __init__(self, query, res_json):
         self.rows = self.__parseRows()
 
         self.index_cache = {}  # (metric, id) -> row value index
-        self.ids = self._findIdentifiers()
+        self.ids = None
 
         if self.query and len(self.query.measurements) > 0:
+            self.ids = self._findIdentifiers()
             self._populate_index_cache()
             self._add_calculated_colunm_headers()