Fix build with -Dvendor-conf-path
c7939ef0 broke the build if -Dvendor-conf-path
is specified. This MR fixes the relevant code, then removes that code :-) and adds a case to CI that would have caught this error.
c7939ef0 broke the build if -Dvendor-conf-path
is specified. This MR fixes the relevant code, then removes that code :-) and adds a case to CI that would have caught this error.