st: Fix crash in theme-node-transition
Setting up the framebuffers for transitions may fail, in which case the material used for drawing is left uninitialized, so trying to access it results in a crash. Instead bail out in this case, which means that we won't paint anything during the transition - still, drawing errors are better than crashes ... https://bugzilla.gnome.org/show_bug.cgi?id=659676
parent
40c5db39
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