Fix a bug in remove-exp.js

[Feiyang1]

Access a path only if it exists.

[changeset-bot]

⚠️ No Changeset found

Latest commit: c9b7aaf

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[github-actions]

Changeset File Check ⚠️

• Changeset formatting error in following file:

  Package "firebase-compat-typings-test" must depend on the current version of "firebase-exp": "9.0.0-beta.6" vs "file:../../packages-exp/firebase-exp"
  Package "firebase-compat-typings-test" must depend on the current version of "firebase-exp": "9.0.0-beta.6" vs "file:../../packages-exp/firebase-exp"
  Package "firebase-compat-typings-test" must depend on the current version of "firebase-exp": "9.0.0-beta.6" vs "file:../../packages-exp/firebase-exp"
  Error: Failed to find where HEAD diverged from master. Does master exist?
      at async getChangedFilesSince (/home/runner/work/firebase-js-sdk/firebase-js-sdk/node_modules/@changesets/git/dist/git.cjs.dev.js:169:22)
      at async Object.getChangedPackagesSinceRef (/home/runner/work/firebase-js-sdk/firebase-js-sdk/node_modules/@changesets/git/dist/git.cjs.dev.js:208:24)
      at async getStatus (/home/runner/work/firebase-js-sdk/firebase-js-sdk/node_modules/@changesets/cli/dist/cli.cjs.dev.js:977:27)
      at async run$1 (/home/runner/work/firebase-js-sdk/firebase-js-sdk/node_modules/@changesets/cli/dist/cli.cjs.dev.js:1227:11)
  

[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (c55f5b0) and head commit (f37d941).

Test Logs

• Base (c55f5b0c): https://github.com/firebase/firebase-js-sdk/actions/runs/995074795
• Head (f37d941d): https://github.com/firebase/firebase-js-sdk/actions/runs/995171322

[google-oss-bot]

Size Analysis Report

Affected Products

No changes between base commit (c55f5b0) and head commit (f37d941).

Test Logs

• Base (c55f5b0): https://github.com/firebase/firebase-js-sdk/actions/runs/995074795
• Head (f37d941): https://github.com/firebase/firebase-js-sdk/actions/runs/995171322