Accept Merge Request #122: (api -> master)

Merge Request: Supplement tag test

Created By: @王琼钰
Accepted By: @王琼钰
URL: https://tjwater.coding.net/p/tjwatercloud/d/TJWaterServer/git/merge/122

test_tjnetwork.py

@@ -1331,6 +1331,10 @@ class TestApi:
         t = get_tag(p, TAG_TYPE_NODE, 'j1')
         assert t['tag'] == 'j1t'
 
+        set_tag(p, ChangeSet({'t_type': TAG_TYPE_NODE, 'id': 'j1', 'tag': None }))
+        t = get_tag(p, TAG_TYPE_NODE, 'j1')
+        assert t['tag'] == None
+
         t = get_tag(p, TAG_TYPE_NODE, 'j2')
         assert t['tag'] == None
         set_tag(p, ChangeSet({'t_type': TAG_TYPE_NODE, 'id': 'j2', 'tag': 'j2t' }))