fix: handover serializer validate bug

apps/wpm/serializers.py

@@ -309,6 +309,9 @@ class MlogSerializer(CustomModelSerializer):
         return attrs
 
 
+class MlogInitSerializer(CustomModelSerializer):
+    pass
+
 class MlogRevertSerializer(serializers.Serializer):
     change_reason = serializers.CharField(label='撤回原因')
 
@@ -345,6 +348,7 @@ class HandoverSerializer(CustomModelSerializer):
             attrs['send_dept'] = attrs['wm'].belong_dept
             if attrs['wm'].mgroup:
                 attrs['send_mgroup'] = attrs['wm'].mgroup
+        material = attrs['material']
         if material.process and material.process.into_wm_mgroup and 'recive_mgroup' not in attrs:
             raise ValidationError('必须指定交接工段')
         if 'recive_mgroup' in attrs and attrs['recive_mgroup']: