vault: check dir value before passing

This fix checks if dirname is not equal to '' before proceeding
to create actual directory with name.

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

lib/ansible/parsing/vault/__init__.py

@@ -927,7 +927,7 @@ def create_file(self, filename, secret, vault_id=None):
         """ create a new encrypted file """
 
         dirname = os.path.dirname(filename)
-        if not os.path.exists(dirname):
+        if dirname and not os.path.exists(dirname):
             display.warning("%s does not exist, creating..." % dirname)
             makedirs_safe(dirname)