Add condition to not populate string value if it's empty

[FikriMilano]

IMPORTANT: All PRs must be linked to an issue (except for extremely trivial and straightforward changes).

Fixes #2520

Description
Add condition to not populate string value if it's empty

Alternative(s) considered
N/A

Type
Bug fix

Screenshots (if applicable)

Screen.Recording.2024-04-23.at.09.20.54.mov

Checklist

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[jingtang10]

This is great - thanks very much for the contribution and jajoo for reviewing.

@FikriMilano, is there any way you can add a test to this? can you add a test file for optionselectdialogfragment? if it's easy to do we can also add a test in QuestionnaireUiEspressoTest

[FikriMilano]

@jingtang10
I've been working on the test for a while now (as a side quest).

When adding unit test, there's an issue of the view within the fragment giving null values e.g. the dialog title returns null even though it has been assigned with a value (The log has passed the code that assign value to the title).

Another issue that might came up is, accessing the viewModel to check the saved options, but the viewModel is private. I need to add a public getter to for the viewmodel, and mark it as VisibleForTesting, if that's ok.

I've tried espresso, there's no issue with the dialog title value, but there's a bit of an issue with accessing the viewModel flow property with coroutine.

So yeah, continuing on this, let's see what I can do.

[MJ1998]

LGTM