If the host, title, company, contentLicense, logoUrl is empty then the old value is updated on Administrator General setting. fix the issue

server/graph/resolvers/site.js

@@ -38,30 +38,25 @@ module.exports = {
   SiteMutation: {
     async updateConfig(obj, args, context) {
       try {
-        if (args.host) {
+        if (args.hasOwnProperty('host')) {
           let siteHost = _.trim(args.host)
           if (siteHost.endsWith('/')) {
             siteHost = siteHost.slice(0, -1)
           }
           WIKI.config.host = siteHost
         }
-
-        if (args.title) {
+        if (args.hasOwnProperty('title')) {
           WIKI.config.title = _.trim(args.title)
         }
-
-        if (args.company) {
+        if (args.hasOwnProperty('company')) {
           WIKI.config.company = _.trim(args.company)
         }
-
-        if (args.contentLicense) {
+        if (args.hasOwnProperty('contentLicense')) {
           WIKI.config.contentLicense = args.contentLicense
         }
-
-        if (args.logoUrl) {
+        if (args.hasOwnProperty('logoUrl')) {
           WIKI.config.logoUrl = _.trim(args.logoUrl)
         }
-
         WIKI.config.seo = {
           description: _.get(args, 'description', WIKI.config.seo.description),
           robots: _.get(args, 'robots', WIKI.config.seo.robots),