add fallback for screenshot

[codeskyblue]

No description provided.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 27.05%. Comparing base (5f3f142) to head (f2c5d5e).

Files	Patch %	Lines
uiautomator2/__init__.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1018      +/-   ##
==========================================
- Coverage   27.07%   27.05%   -0.02%     
==========================================
  Files          20       20              
  Lines        2774     2776       +2     
  Branches      419      420       +1     
==========================================
  Hits          751      751              
- Misses       1994     1996       +2     
  Partials       29       29              

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