Fix WandbLogger Hook Error #8248

[ayulockin]

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Motivation

The motivation is to fix issue #8248.

Modification

Checking if meta dict has key exp_name.

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repos?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Merging #8273 (0b192a7) into master (ca11860) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #8273      +/-   ##
==========================================
+ Coverage   64.17%   64.18%   +0.01%     
==========================================
  Files         361      361              
  Lines       29525    29525              
  Branches     5019     5019              
==========================================
+ Hits        18947    18950       +3     
+ Misses       9575     9574       -1     
+ Partials     1003     1001       -2     

Flag	Coverage Δ
unittests	64.15% <0.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
mmdet/core/hook/wandblogger_hook.py	15.04% <0.00%> (ø)
mmdet/models/roi_heads/mask_heads/maskiou_head.py	89.65% <0.00%> (+2.29%)	⬆️
mmdet/utils/misc.py	64.10% <0.00%> (+2.56%)	⬆️

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