message: fix exception caused when ConfigManager.completionLanguages is undefined.
diff: @@ -101,9 +101,16 @@ export class SQLToolsLanguageClient implements SQLTools.LanguageClientInterface
  version: VSCodeVersion,
  },
  };
  - const selector = ConfigManager.completionLanguages
  - .concat(ConfigManager.formatLanguages)
  - .reduce((agg, language) => {
  + let selector = [];
  + if (ConfigManager.completionLanguages){
  + selector.concat(ConfigManager.completionLanguages);
  + }
  +
  + if (ConfigManager.formatLanguages) {
  + selector.concat(ConfigManager.formatLanguages);
  + }
  +
  + selector = selector.reduce((agg, language) => {
  if (typeof language === 'string') {
  agg.push({ language, scheme: 'untitled' });
  agg.push({ language, scheme: 'file' });
  