Leonardo Hernández Hernández 803a9ba98d Revert "Revert "Check that inhibitor scene tree is not null"" ...

This reverts commit 035bb99d67.

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

2022-12-16 17:20:59 -06:00

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