only set default values for nix-path
if nothing else is set
#11429
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TODO: this doesn't work yet.
we currently have no way of checking if a config value was set or not.
Motivation
this is the expected behavior for default values:
new values should override them, not prepend.
Context
the change fixes a logic bug introduced when fixing the previously confused
override mechanism in e062021.
thanks @roberth for pointing it out:
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