-keys_branch=$(git config hooks.keys_branch 2>/dev/null)
-keys_file=$(git config hooks.keys_file 2>/dev/null)
-keys_pipe_to=$(git config hooks.keys_pipe_to 2>/dev/null)
+keys_branch=$(git config hooks.keys_branch 2>/dev/null || echo "")
+keys_file=$(git config hooks.keys_file 2>/dev/null || echo "")
+keys_pipe_to=$(git config hooks.keys_pipe_to 2>/dev/null || echo "")