fix: make sure asLocatorDescription() tolerates invalid selectors

[dgozman]

Fixes #36559.

[github-actions]

Test results for "tests 1"

12 flaky

⚠️ [chromium-library] › library/popup.spec.ts:258:3 › should not throw when click closes popup @chromium-ubuntu-22.04-node18
⚠️ [chromium-library] › library/chromium/tracing.spec.ts:49:3 › should run with custom categories if provided @chromium-ubuntu-22.04-node20
⚠️ [chromium-library] › library/popup.spec.ts:258:3 › should not throw when click closes popup @chromium-ubuntu-22.04-node20
⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:1087:7 › cli codegen record › should not throw csp directive violation errors @firefox-ubuntu-22.04-node18
⚠️ [firefox-page] › page/page-wait-for-function.spec.ts:104:3 › should work with strict CSP policy @firefox-ubuntu-22.04-node18
⚠️ [chromium-library] › library/inspector/pause.spec.ts:74:5 › pause › should pause and resume the script with keyboard shortcut @ubuntu-22.04-chromium-tip-of-tree
⚠️ [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @ubuntu-latest-node22-1
⚠️ [webkit-library] › library/browsercontext-viewport-mobile.spec.ts:157:5 › mobile viewport › mouse should work with mobile viewports and cross process navigations @webkit-ubuntu-22.04-node18
⚠️ [webkit-library] › library/inspector/pause.spec.ts:74:5 › pause › should pause and resume the script with keyboard shortcut @webkit-ubuntu-22.04-node18
⚠️ [webkit-page] › page/elementhandle-bounding-box.spec.ts:22:3 › should work @webkit-ubuntu-22.04-node18
⚠️ [webkit-page] › page/page-screenshot.spec.ts:345:5 › page screenshot › should work while navigating @webkit-ubuntu-22.04-node18
⚠️ [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @windows-latest-node18-1

47093 passed, 980 skipped
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Merge workflow run.