Still do migrations tests even without CI_DATABASE set

Signed-off-by: Michal Čihař <michal@cihar.com>

ci/run-test

@@ -4,7 +4,7 @@ set -e
 set -x
 
 ./manage.py validate
-if [ "$CI_DATABASE" = sqlite ] ; then 
+if [ "$CI_DATABASE" = sqlite -o -z "$CI_DATABASE" ] ; then 
     ./ci/migrate-testing
 fi
 ./manage.py syncdb --noinput