quick frontend(app): catch exception when trying to remove a missing listener, and log it

sat_frontends/quick_frontend/quick_app.py

@@ -565,7 +565,11 @@ class QuickApp(object):
         @param callback: callback to remove
         """
         assert type_ in C.LISTENERS
-        self._listeners[type_].pop(callback)
+        try:
+            self._listeners[type_].pop(callback)
+        except KeyError:
+            log.error(
+                f"Trying to remove an inexisting listener (type = {type_}): {callback}")
 
     def callListeners(self, type_, *args, **kwargs):
         """Call the methods which listen type_ event. If a profiles filter has