stop installer failing when repository options are not fully specified - fixes #154 (from jure)
stop installer failing when repository options are not fully specified - fixes #154 (from jure)

git-svn-id: fa56b3725f8795e2c24e2b4413b3767e83184823@1393384 13f79535-47bb-0310-9956-ffa450edef68

apache/bloodhound,apache/bloodhound,apache/bloodhound,apache/bloodhound