Catch error when sending dbus notification fails

src/backend/backend.py

@@ -7,6 +7,7 @@ import os
 import re
 import sys
 import time
+import traceback
 from datetime import datetime, timedelta
 from pathlib import Path
 from typing import Any, DefaultDict, Dict, List, Optional, Tuple, Union
@@ -137,6 +138,7 @@ class Backend:
         self.mxc_events: DefaultDict[str, List[Event]] = DefaultDict(list)
 
         self.notification_avatar_cache: Dict[str, Path] = {}  # {mxc: path}
+        self.notifications_working:     bool            = True
 
 
     def __repr__(self) -> str:
@@ -561,6 +563,8 @@ class Backend:
         self, title: str, body: str = "", image: Union[Path, str] = "",
     ) -> None:
         # XXX: images on windows must be .ICO
+
+        try:
             plyer.notification.notify(
                 title    = title,
                 message  = body,
@@ -569,3 +573,9 @@ class Backend:
                 timeout  = 10,
                 toast    = False,
             )
+            self.notifications_working = True
+        except Exception:  # noqa
+            if self.notifications_working:
+                trace = traceback.format_exc().rstrip()
+                log.error("Sending desktop notification failed\n%s", trace)
+                self.notifications_working = False