e35b78f14f
Let's tweak update_environment() a bit: instead of being a NOP when no value is specified, let's actively unset the specified environment variable if it is set. This shouldn't change much, since for the cases we call the function so far the env vars in question should not be set before us in a way we'd set them differently. However, this is nice preparation for later, as we can make use of this for XDG_AREA which we might want to unset if we consider the area dir invalid.
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