Missing check for dir in the 'else' clause

[achaiah]

Motivation

Fixing issue when recursively scanning directories with filenames starting with '.' Without this fix, the if not entry.name.startswith('.') and entry.is_file() logic falls through to the else clause which in the current code base will error out as it encounters '.' files (e.g. .DS_Store)

Modification

Add a check to make sure we only recurse on directories (and ignore '.' files)

BC-breaking (Optional)

No

Use cases (Optional)

N/A

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.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #1110 (39913ba) into master (76d9bf1) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1110   +/-   ##
=======================================
  Coverage   67.96%   67.97%           
=======================================
  Files         159      159           
  Lines       10416    10413    -3     
  Branches     1896     1895    -1     
=======================================
- Hits         7079     7078    -1     
+ Misses       2969     2968    -1     
+ Partials      368      367    -1     

Flag	Coverage Δ
unittests	67.97% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
mmcv/utils/path.py	75.51% <100.00%> (+2.43%)	⬆️

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[ZwwWayne]

lint failed. Any progress @achaiah ? We are considering merge 1110 before the next release.

[achaiah]

lint failed. Any progress @achaiah ? We are considering merge 1110 before the next release.

I updated the code per comments. Not sure if lint will still complain about line length. TBH that's a requirement that should be removed. We don't work in terminals with 80 chars length any more :)

[zhouzaida]

you can refer to https://github.com/open-mmlab/mmcv/blob/master/CONTRIBUTING.md to fix the lint

[zhouzaida]

hi @achaiah, thanks for your contribution. I push a commit to fix the indenterror and CI will be passed

[OpenMMLab-Coodinator]

Hi @achaiah ！First of all, we want to express our gratitude for your significant PR in this project. Your contribution is highly appreciated, and we are grateful for your efforts in helping improve this open-source project during your personal time. We believe that many developers will benefit from your PR.

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