fix: mlog change 导致的bug问题

apps/wpm/views.py

@@ -325,9 +325,11 @@ class MlogViewSet(CustomModelViewSet):
         修改日志
         """
         ins = self.get_object()
+        if ins.submit_time is not None:
+            raise ParseError('该日志已提交!')
         if ins.ticket and ins.ticket.state != State.STATE_TYPE_START:
             raise ParseError('该日志在审批中不可修改!')
-        sr = MlogChangeSerializer(instance=ins, data=request.data)
+        sr = MlogChangeSerializer(instance=ins, data=request.data, partial=True)
         sr.is_valid(raise_exception=True)
         sr.save()
         return Response(MlogSerializer(ins).data)