[Applab/Gamelab] Check if callback is a function before calling

[ajpal]

For applab/gamelab functions that take callbacks, we were checking to see whether the callback was provided, but not checking to make sure the callback was a function. This was resulting in New Relic error e.callback.call is not a function.

Before

There is a warning in the debug console, but we still try to call the callback

After

Links

• New Relic

Testing story

Reviewer Checklist:

• Tests provide adequate coverage
• Code is well-commented
• New features are translatable or updates will not break translations
• Relevant documentation has been added or updated
• User impact is well-understood and desirable
• Pull Request is labeled appropriately
• Follow-up work items (including potential tech debt) are tracked and linked

[maddiedierker]

📞 ☎️