fix import cwd if no cwd

[willmcgugan]

Fixes #2197

[codecov-commenter]

Codecov Report

Merging #2212 (5100a2b) into master (46b1c95) will decrease coverage by 0.16%.
The diff coverage is 81.89%.

@@            Coverage Diff             @@
##           master    #2212      +/-   ##
==========================================
- Coverage   99.07%   98.91%   -0.17%     
==========================================
  Files          72       73       +1     
  Lines        7555     7620      +65     
==========================================
+ Hits         7485     7537      +52     
- Misses         70       83      +13     

Flag	Coverage Δ
unittests	98.91% <81.89%> (-0.17%)	⬇️

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

Impacted Files	Coverage Δ
rich/layout.py	100.00% <ø> (ø)
rich/markup.py	100.00% <ø> (ø)
rich/__init__.py	93.54% <60.00%> (-6.46%)	⬇️
rich/progress.py	92.73% <79.56%> (-0.79%)	⬇️
rich/progress_bar.py	99.00% <85.71%> (-1.00%)	⬇️
rich/console.py	98.89% <86.36%> (-0.33%)	⬇️
rich/_export_format.py	100.00% <100.00%> (ø)
rich/_windows_renderer.py	100.00% <100.00%> (ø)
rich/control.py	100.00% <100.00%> (ø)
rich/file_proxy.py	100.00% <100.00%> (ø)
... and 4 more

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