[Bug] fix raise error bug in registering multiple names

[nbei]

No description provided.

[zhouzaida]

ping @xvjiarui @ZwwWayne

[codecov]

Codecov Report

Merging #949 (bdcf291) into master (54ece10) will decrease coverage by 0.37%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #949      +/-   ##
==========================================
- Coverage   65.64%   65.27%   -0.38%     
==========================================
  Files         149      151       +2     
  Lines        9455     9618     +163     
  Branches     1722     1741      +19     
==========================================
+ Hits         6207     6278      +71     
- Misses       2928     3017      +89     
- Partials      320      323       +3     

Flag	Coverage Δ
unittests	65.27% <100.00%> (-0.38%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmcv/utils/registry.py	98.31% <100.00%> (-0.02%)	⬇️
mmcv/runner/base_module.py	78.78% <0.00%> (-0.63%)	⬇️
mmcv/ops/__init__.py	100.00% <0.00%> (ø)
mmcv/ops/box_iou_rotated.py	100.00% <0.00%> (ø)
mmcv/cnn/bricks/transformer.py	0.00% <0.00%> (ø)
mmcv/ops/fused_bias_leakyrelu.py	30.90% <0.00%> (ø)
mmcv/ops/multi_scale_deform_attn.py	76.66% <0.00%> (ø)
mmcv/ops/roi_align_rotated.py	75.38% <0.00%> (ø)

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[hellock]

What is the intention of this PR?

[nbei]

What is the intention of this PR?

Since we have supported a sequence of names, the logic for raising error should be modified.

[ZwwWayne]

Unit test failed.

[ZwwWayne]

ping @nbei