[ticket/14349] Add cli error message on missing or invalid data

PHPBB3-14349

phpBB/language/en/install.php

@@ -316,6 +316,7 @@ $lang = array_merge($lang, array(
 	'CLI_INSTALL_VALIDATE_CONFIG'	=> 'Validate a configuration file',
 	'CLI_CONFIG_FILE'				=> 'Config file to use',
 	'MISSING_FILE'					=> 'Unable to access file %1$s',
+	'MISSING_DATA'					=> 'Config file is missing data or might contain invalid settings.',
 	'INVALID_YAML_FILE'				=> 'Could not parse YAML file %1$s',
 ));