config: When joining path, avoid empty separators
config: When joining path, avoid empty separators

"" + "something" => "something" and not ":something" or "something:"

ramaxlo/cerbero,flexVDI/cerbero,multipath-rtp/cerbero,sdroege/cerbero,GStreamer/cerbero,sdroege/cerbero,multipath-rtp/cerbero,GStreamer/cerbero,shoreflyer/cerbero,flexVDI/cerbero,shoreflyer/cerbero,fluendo/cerbero,shoreflyer/cerbero,ramaxlo/cerbero,ikonst/cerbero,atsushieno/cerbero,EricssonResearch/cerbero,ford-prefect/cerbero,centricular/cerbero,superdump/cerbero,flexVDI/cerbero,EricssonResearch/cerbero,GStreamer/cerbero,OptoFidelity/cerbero,atsushieno/cerbero,multipath-rtp/cerbero,ikonst/cerbero,atsushieno/cerbero,sdroege/cerbero,fluendo/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,ford-prefect/cerbero,EricssonResearch/cerbero,lubosz/cerbero,nirbheek/cerbero,multipath-rtp/cerbero,nirbheek/cerbero-old,jackjansen/cerbero,ford-prefect/cerbero,nzjrs/cerbero,atsushieno/cerbero,ikonst/cerbero,AlertMe/cerbero,sdroege/cerbero,OptoFidelity/cerbero,multipath-rtp/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,justinjoy/cerbero,nirbheek/cerbero,jackjansen/cerbero,nzjrs/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,lubosz/cerbero,EricssonResearch/cerbero,AlertMe/cerbero,ramaxlo/cerbero,atsushieno/cerbero,OptoFidelity/cerbero,EricssonResearch/cerbero,GStreamer/cerbero,lubosz/cerbero,shoreflyer/cerbero,AlertMe/cerbero,superdump/cerbero,justinjoy/cerbero,nzjrs/cerbero,nirbheek/cerbero-old,nzjrs/cerbero,nzjrs/cerbero,AlertMe/cerbero,fluendo/cerbero,jackjansen/cerbero,GStreamer/cerbero,jackjansen/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,nirbheek/cerbero-old,OptoFidelity/cerbero,flexVDI/cerbero,superdump/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,centricular/cerbero,ramaxlo/cerbero,ikonst/cerbero,centricular/cerbero,justinjoy/cerbero,nirbheek/cerbero,sdroege/cerbero,flexVDI/cerbero,superdump/cerbero,shoreflyer/cerbero,nirbheek/cerbero,fluendo/cerbero,justinjoy/cerbero,nirbheek/cerbero-old,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,ikonst/cerbero,ford-prefect/cerbero,ramaxlo/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,fluendo/cerbero,centricular/cerbero,AlertMe/cerbero,centricular/cerbero,lubosz/cerbero