(network insight) check if target table exists before fetching data

src/opnsense/scripts/netflow/lib/aggregate.py

@@ -355,6 +355,7 @@ class BaseFlowAggregator(object):
         :return: iterator returning dict records (start_time, end_time, [fields], octets, packets)
         """
         result = list()
+        if self.is_db_open() and 'timeserie' in self._known_targets:
             select_fields = self._valid_fields(fields)
             filter_fields = []
             query_params = {}
@@ -418,6 +419,7 @@ class BaseFlowAggregator(object):
         :param end_time: end timestamp
         :return: iterator
         """
+        if self.is_db_open() and 'timeserie' in self._known_targets:
             query_params = {}
             query_params['start_time'] = self._parse_timestamp((int(start_time/self.resolution))*self.resolution)
             query_params['end_time'] = self._parse_timestamp(end_time)