fix tuple of one issue

[willmcgugan]

Fixes #445

[codecov]

Codecov Report

Merging #448 (e17e1d5) into master (ec792ad) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #448   +/-   ##
=======================================
  Coverage   99.61%   99.61%           
=======================================
  Files          54       54           
  Lines        4646     4648    +2     
=======================================
+ Hits         4628     4630    +2     
  Misses         18       18           

Flag	Coverage Δ
unittests	99.61% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
rich/__main__.py	100.00% <100.00%> (ø)
rich/pretty.py	100.00% <100.00%> (ø)

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