[MRM-1804] IndexOutOfBoundsException when browsing a group with 0 or 1 repo
avoid npe

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1568621 13f79535-47bb-0310-9956-ffa450edef68
[MRM-1804] IndexOutOfBoundsException when browsing a group with 0 or 1 repo
fix display

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1568622 13f79535-47bb-0310-9956-ffa450edef68
cleanup

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1568623 13f79535-47bb-0310-9956-ffa450edef68