Fixed updating the list of questions with audio widgets

[grzesiek2010]

Closes #5955
Closes #5956

Why is this the best possible solution? Were any other approaches considered?

If there are multiple audio widgets on one page they all receive updates (recording status) if one of them is working. Those updates just pass null values so this doesn't change their state. If it's such a null value we shouldn't call the WidgetValueChangedListener because then it causes problems like the ones I have fixed in this pull request.

BTW. I'm not sure if other (not active) audio widgets should receive such null values as states (it might be redundant) but there is a test for that scenario so I didn't feel confident enough to change this behavior.

How does this change affect users? Describe intentional changes to behavior and behavior that could have accidentally been affected by code changes. In other words, what are the regression risks?

We can focus on testing audio widgets here. The problem seemed to be visible only when more than one audio widget was used in a field-list but let's test simple cases with just one widget too.

Do we need any specific form for testing your changes? If so, please attach one.

No.

Does this change require updates to documentation? If so, please file an issue here and include the link below.

No.

Before submitting this PR, please make sure you have:

• added or modified tests for any new or changed behavior
• run ./gradlew connectedAndroidTest (or ./gradlew testLab) and confirmed all checks still pass
• added a comment above any new strings describing it for translators
• verified that any code or assets from external sources are properly credited in comments and/or in the about file.
• verified that any new UI elements use theme colors. UI Components Style guidelines

[grzesiek2010]

@lognaturel I've assigned you as a reviewer but if you want @seadowg to do that when he's back please unusign yourself.

[lognaturel]

Seems reasonable to me and I certainly don’t see any other obvious approach.

[srujner]

Tested with Success!

Verified on device with Android 13

Verified cases:

• Issue Scrolling doesn’t work in a group of questions while audio is being recorded #5955 and Unable to record second sound if audio widgets are in a field-list #5956 are no longer reproducing;
• Regression check on Audio Widgets, Background Recording;
• Checked Other forms with Audio;
• Don't keep activities enabled/disabled;
• Change recording settings in the middle of filling the form
• Light and dark mode
• Rotate the screen, minimize the app

[dbemke]

Tested with Success!

Verified on device with Android 10