Add app hang retries guard

[Cawllec]

Goal

Adds conditional & (checks to see if an element is nil before accessing it's properties) in the logic to ensure result and exception are present.

[github-actions]

Bugsnag.framework binary size did not change - 713,264 bytes

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  [ = ]       0  [ = ]       0    TOTAL

Generated by 🚫 Danger