[Tseian]

When an unquoted value is empty but followed by spaces or tabs
(KEY= ), the dotenv parser trimmed the newline together with the
whitespace and took the next line as the value:

$ node -p 'util.parseEnv("SENTRY_DSN= \nDATABASE_URL=postgres://localhost/app")'
{ SENTRY_DSN: 'DATABASE_URL=postgres://localhost/app' }

Strip only spaces and tabs before checking for an empty value. This
affects both util.parseEnv() and --env-file.

Fixes: #67400

🤖 Generated with Claude Code

[nodejs-github-bot]

Review requested:

• @nodejs/config

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.73%. Comparing base (e8c1160) to head (8faa050).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #67404      +/-   ##
==========================================
- Coverage   90.74%   90.73%   -0.02%     
==========================================
  Files         798      798              
  Lines      280102   280104       +2     
  Branches    53901    53900       -1     
==========================================
- Hits       254186   254147      -39     
- Misses      16198    16250      +52     
+ Partials     9718     9707      -11     

Files with missing lines	Coverage Δ
src/node_dotenv.cc	84.90% <100.00%> (+0.14%)	⬆️

... and 28 files with indirect coverage changes

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