fix(doctor): fixed when registry is offline

Author: Milan Meva

lib/commands/doctor.js

@@ -139,7 +139,7 @@ class Doctor extends BaseCommand {
   async checkPing () {
     log.info('doctor', 'Pinging registry')
     try {
-      await ping({ ...this.npm.flatOptions, retry: false })
+      await ping({ ...this.npm.flatOptions, cache: false, retry: false })
       return ''
     } catch (er) {
       if (/^E\d{3}$/.test(er.code || '')) {