[P] Fix datasource unit tests

MapView/datasource.py

@@ -39,7 +39,11 @@ class Datasource:
         self.connection_status = None
         self._new_points = []
         self._active_markers = []
-        asyncio.ensure_future(self.connect_to_server())
+
+        try:
+            asyncio.ensure_future(self.connect_to_server())
+        except RuntimeError:
+            Logger.info("No event loop detected, running in offline mode")
 
     def get_new_points(self):
         Logger.debug(self._new_points)