Update server google/dropbox config check

Author: Yukaii

lib/config.js

@@ -90,11 +90,11 @@ var gitlab = (process.env.HMD_GITLAB_CLIENTID && process.env.HMD_GITLAB_CLIENTSE
 var dropbox = (process.env.HMD_DROPBOX_CLIENTID && process.env.HMD_DROPBOX_CLIENTSECRET) ? {
     clientID: process.env.HMD_DROPBOX_CLIENTID,
     clientSecret: process.env.HMD_DROPBOX_CLIENTSECRET
-} : config.dropbox || false;
+} : (config.dropbox && config.dropbox.clientID && config.dropbox.clientSecret) || false;
 var google = (process.env.HMD_GOOGLE_CLIENTID && process.env.HMD_GOOGLE_CLIENTSECRET) ? {
     clientID: process.env.HMD_GOOGLE_CLIENTID,
     clientSecret: process.env.HMD_GOOGLE_CLIENTSECRET
-} : config.google || false;
+} : (config.google && config.google.clientID && config.google.clientSecret) || false;
 var imgur = process.env.HMD_IMGUR_CLIENTID || config.imgur || false;
 var email = process.env.HMD_EMAIL ? (process.env.HMD_EMAIL === 'true') : !!config.email;