Improvements to Get-IncidentList - Output Object

[rbury]

Is your feature request related to a problem? Please describe.
Improve Get-IncidentList for compatibility and usability

Describe the solution you'd like
All returns should be a pscutomobject to comply with signature.

Describe alternatives you've considered
N/A

Additional context
On error a string is returned instead of a pscustomobject, this would not be expected as it is a return value.