correct deletion of publish diagnostics entry

Author: d-biehl

robotcode/language_server/common/parts/diagnostics.py

@@ -181,7 +181,7 @@ async def on_did_change(self, sender: Any, document: TextDocument) -> None:
 
     @_logger.call
     def _delete_entry(self, e: PublishDiagnosticsEntry) -> None:
-        if self._running_diagnostics[e.uri] == e:
+        if e.uri in self._running_diagnostics and self._running_diagnostics[e.uri] == e:
             self._running_diagnostics.pop(e.uri, None)
 
     @_logger.call