If user does not exist desc user xxx will be raise "User not existed!"

[Milittle]

If user does not exist desc user xxx will be raise "User not existed!"

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Close #5141

Description:

If use does not exist desc user xxx will be raise "User not existed!"

How do you solve it?

add account exist verify in meta service

Special notes for your reviewer, ex. impact of this fix, design document, etc:

Checklist:

Tests:
manunal test:

(root@nebula) [(none)]> desc user u6
[ERROR (-1005)]: User not existed!

Wed, 15 Feb 2023 22:43:06 CST

• Unit test(positive and negative cases)
• Function test
• Performance test
• N/A

Affects:

• Documentation affected (Please add the label if documentation needs to be modified.)
• Incompatibility (If it breaks the compatibility, please describe it and add the label.）
• If it's needed to cherry-pick (If cherry-pick to some branches is required, please label the destination version(s).)
• Performance impacted: Consumes more CPU/Memory

Release notes:

Please confirm whether to be reflected in release notes and how to describe:

ex. Fixed the bug .....

[CLAassistant]

All committers have signed the CLA.

[Milittle]

if have any problem, leave message here, thanks.

May i need change my git account. wait me fix this.

[Sophie-Xie]

if have any problem, leave message here, thanks.

May i need change my git account. wait me fix this.

Thanks for contribution! Pls fix the CI when your account is OK. :)

[Milittle]

if have any problem, leave message here, thanks.
May i need change my git account. wait me fix this.

Thanks for contribution! Pls fix the CI when your account is OK. :)

Done

[yixinglu]

Good Job!