message: make the failed to check for updates log error more obvious when it is an npm registry issue
diff: @@ -635,7 +635,7 @@ export class PluginsService {
  plugin.author = (pkg.maintainers.length) ? pkg.maintainers[0].name : null;
  } catch (e) {
  if (e.statusCode !== 404) {
  - this.logger.error(`[${plugin.name}] ${e.message}`);
  + this.logger.log(`[${plugin.name}] Failed to check registry.npmjs.org for updates: ${e.message}`);
  }
  plugin.publicPackage = false;
  plugin.latestVersion = null;
  