Exception handling for changed dict while loop in videv_base

base.py

@@ -65,9 +65,12 @@ class videv_base(mqtt_base):
         self.__periodic__.run()
 
     def send_all(self, rt):
-        for key in self:
-            if self[key] is not None:
-                self.__tx__(key, self[key])
+        try:
+            for key in self:
+                if self[key] is not None:
+                    self.__tx__(key, self[key])
+        except RuntimeError:
+            self.logger.warning("Runtimeerror while sending cyclic videv information. This may happen on startup.")
 
     def add_display(self, my_key, ext_device, ext_key, on_change_only=True):
         """