[INTERNAL] fix for commit bfd7087cf5316e155f6e4d5106e224a34911b8f5

The refactoring removed the check to skip project creation if the
project already exists. This fix added the check back.

Change-Id: I06bc9bd7269777f8ecaec4d575dd93d1b45add3e
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1665
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>