fix :enm service.py 修改缓存不存在直接返回

apps/enm/services.py

@@ -142,7 +142,8 @@ class MpointCache:
             try:
                 mpoint = Mpoint.objects.get(code=code)
             except Exception:
-                return None
+                cache.set(key, {}, timeout=None)
+                return {}
             mpoint_data = MpointSerializer(instance=mpoint).data
             mpoint_data["last_data"] = {"last_val": None, "last_timex": None, "last_mrs": None}  # 初始化
             if update_mplogx:
@@ -324,7 +325,7 @@ def insert_mplogx_item(code: str, val, timex: datetime, enp_mpoints_dict):
     """
     mc = MpointCache(code)
     mpoint_data = mc.data
-    if mpoint_data is None or not mpoint_data["enabled"]:
+    if mpoint_data in (None, {}) or not mpoint_data["enabled"]:
         return
 
     mpoint_interval = mpoint_data["interval"]