my personal dwl config managed with pijul.

Revert "Revert "Check that inhibitor scene tree is not null""

This reverts commit 035bb99d67b59a84cfc2e911d222fb597591a8be.

Not checking tree != NULL result in a segfault if the surface doesn't have a role (for example because it is a newly created surface)

Closes: https://github.com/djpohly/dwl/issues/359

Created by  Leonardo Hernández Hernández  on December 16, 2022
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