Ignore Whitespace-Only Lines

[cpisciotta]

Some xcodebuild output is indented, but only contains whitespace. Remove the indentation to see if a line contains any non-whitespace content.

Note: In the future, xcbeautify should probably attempt to more closely match xcodebuild's newline formatting, but this avoids excessive newlines until that formatting logic is implemented.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.89%. Comparing base (87008cd) to head (59089b6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #357   +/-   ##
=======================================
  Coverage   89.89%   89.89%           
=======================================
  Files          17       17           
  Lines        2404     2404           
=======================================
  Hits         2161     2161           
  Misses        243      243           

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