fix most of the entity creation warning

virtualsensors.py

@@ -46,6 +46,11 @@ class VirtualSensorBase:
         if super_entity_id != None:
             self.constants['super'] = super_entity_id
 
+        self.entity_existed = self.ad_api.entity_exists(self.sensor_name)
+        if not self.entity_existed:
+            self.ad_api.set_state(self.sensor_name, state='unknown',attributes=self.attributes, check_existence=False)
+        self.entity = self.ad_api.get_entity(self.sensor_name)
+
         if self_initialize: 
             self._initialize()