Fix #289 Updated event loop property in busylight.lights.taskable.Tas…

…kableMixin

As I understand it, when lights are activated in a thread other than
the main thread there is not a default async event loop available and
asyncio.get_event_loop raises a RuntimeError. I've modified the
property TaskableMixin.event_loop to catch RuntimeError and create an
event loop.

busylight/lights/taskable.py

@@ -5,6 +5,8 @@
 
 from typing import Any, Awaitable, Dict, Optional
 
+from loguru import logger
+
 
 class TaskableMixin:
     """This mixin class is designed to associate and manage
@@ -18,7 +20,13 @@ def event_loop(self):
             return self._event_loop
         except AttributeError:
             pass
-        self._event_loop = asyncio.get_event_loop()
+        try:
+            self._event_loop = asyncio.get_event_loop()
+        except Exception as error:
+            logger.debug("get_event_loop raised {error}")
+            self._event_loop = asyncio.new_event_loop()
+            asyncio.set_event_loop(self._event_loop)
+
         return self._event_loop
 
     @property