Supporting no stdout, fix force color bug

[darrenburns]

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate.
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

Fixes #2400.

Ensures RIch can run when stdout is not available (for example from pythonw).

I've tested on a Windows machine and ensured that you can use a console (and capture from it) as expected when using python.

Also fixes the issue with FORCE_COLOR.

[codecov-commenter]

Codecov Report

Merging #2513 (f996337) into master (3b7728b) will increase coverage by 2.97%.
The diff coverage is 91.46%.

@@            Coverage Diff             @@
##           master    #2513      +/-   ##
==========================================
+ Coverage   95.67%   98.64%   +2.97%     
==========================================
  Files          72       73       +1     
  Lines        7767     7832      +65     
==========================================
+ Hits         7431     7726     +295     
+ Misses        336      106     -230     

Flag	Coverage Δ
unittests	98.64% <91.46%> (+2.97%)	⬆️

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

Impacted Files	Coverage Δ
rich/box.py	100.00% <ø> (ø)
rich/color.py	100.00% <ø> (ø)
rich/scope.py	100.00% <ø> (ø)
rich/console.py	98.01% <69.23%> (+1.29%)	⬆️
rich/logging.py	97.43% <75.00%> (-2.57%)	⬇️
rich/pretty.py	98.97% <90.00%> (-0.26%)	⬇️
rich/_null_file.py	100.00% <100.00%> (ø)
rich/repr.py	100.00% <100.00%> (ø)
rich/cells.py	100.00% <0.00%> (+3.94%)	⬆️
... and 2 more

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[willmcgugan]

Might want to add a test for the correct behaviour when FORCE_COLOR is empty string