[eas-cli] fix formatFields to handle empty array

[quinlanj]

Why

When formatting fields with an empty array, the code would attempt to find the maximum label length, causing an error when reducing an empty array (Reduce of empty array with no initial value). This needs to be fixed to handle empty arrays gracefully.

How

Added an early return statement that checks if the input fields array is empty, returning an empty string before attempting to calculate the column width.

Test Plan

• Ran into the empty array case by running EXPO_STAGING=1 ~/Documents/eas-cli/packages/eas-cli/bin/run fingerprint:compare 796b89315aeaa4b466aa3ac6c2dcff5cf9ed4c8e d5de1b929c0346251e400eed13205fda4eaf51bf

[quinlanj]

• [eas-cli] fix formatFields to handle empty array #2914 👈 (View in Graphite)
• main

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[github-actions]

Size Change: -186 B (0%)

Total Size: 53.5 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	53.5 MB	-186 B (0%)

_{compressed-size-action}

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 52.63%. Comparing base (4b8a9d1) to head (602ae14).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/eas-cli/src/utils/formatFields.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2914      +/-   ##
==========================================
- Coverage   52.63%   52.63%   -0.00%     
==========================================
  Files         588      588              
  Lines       23200    23202       +2     
  Branches     4859     4860       +1     
==========================================
+ Hits        12210    12211       +1     
- Misses      10021    10022       +1     
  Partials      969      969              

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[github-actions]

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File Patterns	Mentions
**/*	@szdziedzic, @khamilowicz, @sjchmiela, @radoslawkrzemien

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[github-actions]

✅ Thank you for adding the changelog entry!