Fix ReferenceError when doSearch is not yet available

[Kunal241207]

This PR fixes a ReferenceError that occurs when doSearch() is invoked
before it is available on page load.

In some load orders, doSearch is defined later (e.g. under
window.activity), causing the initial call in $(document).ready()
to fail and stop further script execution.

The fix safely checks for doSearch in both locations before calling
it, preventing the error while preserving existing behavior.

Fixes #5313

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.

[kartikktripathi]

Hey, I tested your changes and looked through the code. Everything looks good to me.
Thanks for the contribution!

[Kunal241207]

Thanks a lot for the review!
Since the checks have passed, could a maintainer with write access please approve/merge when convenient?

[kartikktripathi]

Right, there's a load of other PRs open right now, hope yours will be checked and merged soon.

[Ashish-Rautela]

Search is not working after the changes

[kartikktripathi]

Thanks for flagging this, good catch. I re-tested, and it looks like the new guard prevents the ReferenceError but can also skip initialising search entirely when doSearch isn’t available yet.

[Kunal241207]

Closing this PR since the issue has been resolved in #5676. Thank you!