[#866] - guard against already-good trackers
[#866] - guard against already-good trackers

heiths/allura,heiths/allura,apache/allura,lym/allura-git,apache/allura,leotrubach/sourceforge-allura,leotrubach/sourceforge-allura,leotrubach/sourceforge-allura,apache/allura,heiths/allura,Bitergia/allura,lym/allura-git,Bitergia/allura,Bitergia/allura,lym/allura-git,lym/allura-git,apache/allura,lym/allura-git,heiths/allura,apache/incubator-allura,apache/incubator-allura,apache/incubator-allura,apache/incubator-allura,apache/allura,Bitergia/allura,heiths/allura,Bitergia/allura,leotrubach/sourceforge-allura