server: handle event exceptions

Don't allow exceptions to propagate beyond a call to
_process_event().  Make sure the future is not marked
as done prior to setting the result.

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

moonraker/moonraker.py

@@ -293,13 +293,17 @@ class Server:
                              ) -> None:
         events = self.events.get(event, [])
         coroutines: List[Coroutine] = []
-        for func in events:
-            ret = func(*args)
-            if ret is not None:
-                coroutines.append(ret)
-        if coroutines:
-            await asyncio.gather(*coroutines)
-        fut.set_result(None)
+        try:
+            for func in events:
+                ret = func(*args)
+                if ret is not None:
+                    coroutines.append(ret)
+            if coroutines:
+                await asyncio.gather(*coroutines)
+        except ServerError as e:
+            logging.exception(f"Error Processing Event: {fut}")
+        if not fut.done():
+            fut.set_result(None)
 
     def register_remote_method(self,
                                method_name: str,