fix grack accessing files beginning with .git
Created by: jojosch
when accessing a file called .git[something]
in the file browser (in the root folder or any other folder), grack is invoked.
with this fix grack is only invoked, if the http-git url http://mydomain.tld/[NAMESPACE]/[REPO].git
is cloned.
Accessing
http://mydomain.tld/[NAMESPACE]/[REPO]/tree/master/.gitignore
or http://mydomain.tld/[NAMESPACE]/[REPO]/tree/master/subfolder/subfolder/.gitkeep
or
http://mydomain.tld/[NAMESPACE]/[REPO]/tree/master/subfolder/.gitrules
is now possible and does not invoke grack anymore.
solves part of #2449