Fix NPE when getting user's fork without repository list caching (issue-182)

When a user does not have a fork of a project, getProjectModel returns
null. So we guard against null before dereferencing the returned
project.
Merge branch 'issue-182' of git://git.quelltextlich.at/gitblit into issue182
Documentation
Removed accidentally committed file and updated ignore file
Change level of authentication logging to debug
Fixed internal error on folder history links (issue 192)
Added weblogic.xml to WAR for deployment on WebLogic (issue 199)
Fixed incorrect icon file name for .doc files (issue 200)
Do not queue emails with no recipients (issue 200)
Use standard ServletRequestWrapper instead of custom wrapper (issue 224)
Fixed extracting Groovy scripts on Express installs (issue 220)