better error message for common git clone error

[bendichter]

Motivation

fix #1564

fix #1563

How to test the behavior?

I am not sure how to test this properly.

Checklist

• Did you update CHANGELOG.md with your changes?
• Have you checked our Contributing document?
• Have you ensured the PR clearly describes the problem and the solution?
• Is your contribution compliant with our coding style? This can be checked running flake8 from the source directory.
• Have you checked to ensure that there aren't other open Pull Requests for the same change?
• Have you included the relevant issue number using "Fix #XXX" notation where XXX is the issue number? By including "Fix #XXX" you allow GitHub to close issue #XXX when the PR is merged.

[codecov]

Codecov Report

Merging #1591 (95f247d) into dev (a4ef56f) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev    #1591      +/-   ##
==========================================
- Coverage   91.34%   91.30%   -0.04%     
==========================================
  Files          25       25              
  Lines        2507     2508       +1     
  Branches      471      471              
==========================================
  Hits         2290     2290              
- Misses        137      138       +1     
  Partials       80       80              

Flag	Coverage Δ
integration	70.53% <0.00%> (-0.03%)	⬇️
unit	84.40% <0.00%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
src/pynwb/__init__.py	75.57% <0.00%> (-0.59%)	⬇️

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[bendichter]

@rly any idea why the codecov is failing?

[rly]

Sometimes codecov has a connection error, or I think when we do a bunch of commits in quick succession and some actions get canceled, the coverage uploader gets confused. So I just re-run the jobs.