english fix
fix missing Database folder when there is nothing to do for database

Conflicts:
	bonita-migration-distrib/src/main/groovy/org/bonitasoft/migration/core/MigrationRunner.groovy
Merge branch 'master' into BS-2037

Conflicts:
	bonita-migration-distrib/src/main/groovy/org/bonitasoft/migration/core/MigrationRunner.groovy