if the generated string is not long enough, retry

lib/secure-random-string.js

@@ -32,7 +32,7 @@ function srs(options, cb) {
 			string = string.replace(/\//g, '_').replace(/\+/g, '-');
 		}
 		if (string.length < length) {
-			throw new Error(`Generated string is too short. Please catch this Error and try again.`);
+			return _finish(crypto.randomBytes(length));
 		}
 		return string.substr(0, length);
 	}