fix: batchst create bug

apps/wpm/models.py

@@ -589,13 +589,11 @@ class BatchSt(BaseModel):
         """
         创建新的批次
         """
-        try:
-            BatchSt.objects.get(batch=batch)
-            raise ParseError(f"{batch} 该批号不可使用")
-        except BatchSt.DoesNotExist:
-            if mio is None and handover is None and mlog is None:
-                raise ParseError("mio or handover or mlog must be provided")
-            BatchSt.objects.create(batch=batch, mio=mio, handover=handover, mlog=mlog)
+        if BatchSt.objects.filter(batch=batch).exists():
+            raise ParseError(f"{batch} 该批号已存在不可用")
+        if mio is None and handover is None and mlog is None:
+            raise ParseError("mio or handover or mlog must be provided")
+        BatchSt.objects.create(batch=batch, mio=mio, handover=handover, mlog=mlog)