fix(project): add empty path check, throw error on unresolved path

[aim4ik11]

What/Why/How?

Currently extends property parser in config accepts not existing refs which causes builder to attempt to resolve those and throw hard error which could be hard to debug for user. I suggest adding more descriptive error message so that builder displays it

Reference

Issue

Check yourself

• Code changed? - Tested with Redoc/Realm/Reunite (internal)
• All new/updated code is covered by tests
• New package installed? - Tested in different environments (browser/node)
• Documentation update considered

Security

• The security impact of the change has been considered
• Code follows company security practices and guidelines

[changeset-bot]

⚠️ No Changeset found

Latest commit: e17ae00

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[github-actions]

Command	Mean [s]	Min [s]	Max [s]	Relative
redocly lint resources/rebilly.yaml	1.441 ± 0.019	1.407	1.472	1.00
redocly-next lint resources/rebilly.yaml	1.457 ± 0.038	1.404	1.537	1.01 ± 0.03

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	78.4% (🎯 78%)	6193 / 7899
🔵	Statements	77.8% (🎯 78%)	6399 / 8224
🔵	Functions	81.83% (🎯 81%)	1266 / 1547
🔵	Branches	70.16% (🎯 70%)	4244 / 6049

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/core/src/lint.ts	94.11%	88.23%	100%	94%	109-120, 143
packages/core/src/bundle/bundle.ts	94.73%	86.66%	100%	94.73%	100
packages/core/src/config/bundle-extends.ts	87.5%	83.33%	100%	87.5%	42, 49
packages/core/src/config/config-resolvers.ts	72.45%	58.28%	93.33%	73.17%	67, 70, 90-93, 143, 184, 250, 261, 270, 283, 293, 296-300, 305-314, 337-339, 349, 352, 355, 358, 361, 374-376, 380, 386, 389, 392-395, 398-401, 404-407, 421-423, 430, 433, 436, 439, 442, 445, 475-486, 491-504
packages/core/src/config/config.ts	65.12%	68.24%	78.04%	65.51%	204-231, 257, 261, 265-283, 315, 333-353, 432-462
packages/core/src/config/load.ts	86.95%	72.41%	100%	90.9%	31, 52, 92
packages/core/src/rules/config/config-no-unresolved-refs.ts	66.66%	55.55%	83.33%	76.47%	13, 18, 29-32, 39
packages/core/src/types/redocly-yaml.ts	90.16%	76.66%	100%	89.65%	358, 360, 412, 415, 418, 426

Generated in workflow #8216 for commit e17ae00 by the Vitest Coverage Report Action

[RomanHotsiy]

it's missing file path of where it happens

[AlbinaBlazhko17]

Let's investigate if we can use reportUnresolvedRef in some place to resolve this issue.
https://github.com/Redocly/redocly-cli/blob/main/packages/core/src/rules/common/no-unresolved-refs.ts