fix: empty env variables should be ignored

[Meierschlumpf]

Homarr

Thank you for your contribution. Please ensure that your pull request meets the following pull request:

• Builds without warnings or errors (pnpm buid, autofix with pnpm format:fix)
• Pull request targets dev branch
• Commits follow the conventional commits guideline
• No shorthand variable names are used (eg. x, y, i or any abbrevation)

Closes #1984

[deepsource-io]

Here's the code health analysis summary for commits 243d7e9..6a95d0f. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success	🎯 2 occurences resolved	View Check ↗

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	21.29%	8403 / 39457
🔵	Statements	21.29%	8403 / 39457
🔵	Functions	25.49%	312 / 1224
🔵	Branches	62.27%	951 / 1527

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
apps/nextjs/src/env.ts	0%	0%	0%	0%	1-39
packages/auth/env.ts	57.83%	0%	100%	57.83%	11-21, 34-43, 46-59
packages/common/env.ts	100%	100%	100%	100%
packages/db/env.ts	73.07%	16.66%	100%	73.07%	33, 36, 38-49

Generated in workflow #4700 for commit 6a95d0f by the Vitest Coverage Report Action