Add more check about drop zone with created space

[darionyaphet]

(root@nebula) [(none)]> add zone z1 "192.168.8.215":55501
Execution succeeded (time spent 4793/5348 us)

Mon, 27 Sep 2021 23:05:57 CST

(root@nebula) [(none)]> add group g1 z1
Execution succeeded (time spent 2695/3292 us)

Mon, 27 Sep 2021 23:06:02 CST

(root@nebula) [(none)]> create space s2 (vid_type=int, replica_factor=1, partition_num=1) on g1
Execution succeeded (time spent 3023/3567 us)

Mon, 27 Sep 2021 23:06:17 CST

(root@nebula) [(none)]> drop zone z1 from group g1
[ERROR (-1005)]: Conflict!

Mon, 27 Sep 2021 23:06:30 CST

[codecov-commenter]

Codecov Report

Merging #2942 (5a3c932) into master (dddf54e) will decrease coverage by 0.72%.
The diff coverage is 61.94%.

❗ Current head 5a3c932 differs from pull request most recent head 6f3db5d. Consider uploading reports for the commit 6f3db5d to get more accurate results

@@            Coverage Diff             @@
##           master    #2942      +/-   ##
==========================================
- Coverage   85.47%   84.75%   -0.73%     
==========================================
  Files        1229     1231       +2     
  Lines      110375   110830     +455     
==========================================
- Hits        94341    93931     -410     
- Misses      16034    16899     +865     

Impacted Files	Coverage Δ
src/clients/meta/MetaClient.h	92.30% <ø> (ø)
src/common/utils/NebulaKeyUtils.cpp	89.03% <0.00%> (-4.89%)	⬇️
src/common/utils/NebulaKeyUtils.h	78.02% <ø> (ø)
src/graph/planner/plan/Admin.cpp	54.23% <0.00%> (-2.40%)	⬇️
src/graph/planner/plan/PlanNode.h	80.00% <ø> (ø)
src/graph/service/PermissionCheck.cpp	83.72% <ø> (+2.32%)	⬆️
src/kvstore/KVEngine.h	100.00% <ø> (ø)
src/kvstore/RocksEngine.cpp	82.01% <0.00%> (-1.51%)	⬇️
src/kvstore/RocksEngine.h	66.66% <0.00%> (-25.00%)	⬇️
src/meta/MetaServiceHandler.h	100.00% <ø> (ø)
... and 116 more

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