Sybren A. Stüvel a666b87f7f Manager: warn when the blender variable has no value
When the `blender` variable has no value, Flamenco will not be able to
run Blender, which is worth emitting a warning about early on.

This required a bit of a reshuffle of the configuration loading logic, to
avoid loading things twice (and thus warning twice).

Fixes part of #104366
2025-03-20 13:09:42 +01:00
..