Fix a number of issues
    
    Avoid crash when KMS node starts returning NULL resources
    Resolves: #1812423
    
    Fixes landed after 3.34.4
    Resolves: #1808450
    Resolves: #1808107
    Resolves: #1807576
    Resolves: #1806600
    
    Don't crash when fullscreen on inert wl_output
    Resolves: #1791357