fixed minor issue with remote duration conversion

dispatcher/views.py

@@ -267,7 +267,8 @@ def set_clocking(request, date: datetime.date):
     clocking.out_pm = request.POST.get("out_pm", clocking.out_pm) or None
     remote = request.POST.get("remote", clocking.remote) or None
     if remote is not None:
-        remote = str_to_timedelta(remote)
+        if isinstance(remote, str):
+            remote = str_to_timedelta(remote)
     else:
         remote = timedelta()
     clocking.remote = remote
@@ -307,4 +308,4 @@ def set_real_sagex(request, id, month: datetime.date):
     return JsonResponse({
         "status": "success",
         "sagex": RealSageXHoursSerializer(entry).data
-    })
+    })