Fix - Fixed if sentence to correctly use the supervisor API for publi…

…sh data

src/emhass/retrieve_hass.py

@@ -213,7 +213,7 @@ def post_data(self, data_df: pd.DataFrame, idx: int, entity_id: str,
         :type friendly_name: str
 
         """
-        if self.params is None: # If this is the case we suppose that we are using the supervisor API
+        if self.params is not None: # If this is the case we suppose that we are using the supervisor API
             url = self.hass_url+"/states/"+entity_id
         else: # Otherwise the Home Assistant Core API it is
             url = self.hass_url+"api/states/"+entity_id