Undefined behavior on DispatchRays renderpass with invalid RTHandle config

Steps to reproduce:

1. Checkout linusja-unity/UniSTIR: Unity ReSTIR Example (WIP) 

2. Set enableRandomWrite to false in "RayTracingPostProcessingRenderingFeature.cs" 

3. Notice nothing is displayed and no error in log 

Actual results: 
Ray tracing is not generated

Expected results: 
Expect an error or something similar to how compute shader dispatch does 

Reproducible with versions: 
6000.0.27

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

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