PostProcessEffectSettings.GetHash() throws "NullReferenceException" when the effect has a texture parameter set to null

How to reproduce:

1. Open the attached "IN-157478" project
2. In the menu bar, select "Tools" > "Bug Repros" > "Post Processing GetHash with null textures"
3. Observe the "Bloom", "Vignette", "ColorGrading" and "ChromaticAberration" messages in the Console

Actual result: GetHash() throws "NullReferenceException" for new Bloom, Vignette, ColorGrading and ChromaticAberration settings
Expected result: GetHash() returns a hash for every effect, the same as for AutoExposure

Reproducible with: 3.4.0 (6000.0.0f1), 3.5.4 (6000.7.0b6, 7000.0.0a10)

Reproducible on: Windows 10 (by user), Windows 11
Not reproducible on: No other environments tested