fixes for select_instrument

influxgraph.py

@@ -160,6 +160,8 @@ class InfluxGraph(HandlerBase):
         if self.instrument:
             streams, tags, self.device_name = self.server.lookup_streams(self.instrument, **self.init_tags)
             self.tags = {**self.init_tags, **tags}
+        else:
+            self.tags = self.init_tags
         blocks = self.get_available_variables(start_time, end_time, self.chart_configs, userconfiguration)
         # initialize self.last_values to keep track of the available variables
         self.last_values = {var["name"]: [0, None] for block in blocks for var in block["curves"]}