Fixes crash accessing IndexPath's section

[simonmitchell]

Description

Fixes crash caused when we are sent an IndexPath with 0 elements in it's indexes array (occasionally when VoiceOver enabled). See: https://developer.apple.com/forums/thread/663787

Motivation and Context

Fixes a crash in (potentially) all of our apps when VoiceOver enabled

How Has This Been Tested?

Tested locally in ARC Emergency

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.