don't show a checkbox for the terms of service if they don't exist

customize.dist/pages/register.js

@@ -10,13 +10,14 @@ define([
         var urlArgs = Config.requireConf.urlArgs;
 
         var tos = $(UI.createCheckbox('accept-terms')).find('.cp-checkmark-label').append(Msg.register_acceptTerms).parent()[0];
+
+        var termsLink = Pages.customURLs.terms;
         $(tos).find('a').attr({
-            href: '/terms.html',
+            href: termsLink, // '/terms.html',
             target: '_blank',
             tabindex: '-1',
         });
 
-
         var frame = function (content) {
             return [
                 h('div#cp-main', [
@@ -38,6 +39,11 @@ define([
             ]);
         }
 
+        var termsCheck;
+        if (termsLink) {
+            termsCheck = h('div.checkbox-container', tos);
+        }
+
         return frame([
             h('div.row.cp-register-det', [
                 h('div#data.hidden.col-md-6', [
@@ -72,9 +78,7 @@ define([
                         h('div.checkbox-container', [
                             UI.createCheckbox('import-recent', Msg.register_importRecent, true)
                         ]),
-                        h('div.checkbox-container', [
-                            tos,
-                        ]),
+                        termsCheck,
                         h('button#register', Msg.login_register)
                     ])
                 ]),

www/register/main.js

@@ -11,9 +11,10 @@ define([
     '/common/common-feedback.js',
     '/common/outer/local-store.js',
     '/common/hyperscript.js',
+    '/customize/pages.js',
 
     'css!/bower_components/components-font-awesome/css/font-awesome.min.css',
-], function ($, Login, Cryptpad, /*Test,*/ Cred, UI, Util, Realtime, Constants, Feedback, LocalStore, h) {
+], function ($, Login, Cryptpad, /*Test,*/ Cred, UI, Util, Realtime, Constants, Feedback, LocalStore, h, Pages) {
     if (window.top !== window) { return; }
     var Messages = Cryptpad.Messages;
     $(function () {
@@ -58,7 +59,14 @@ define([
             var confirmPassword = $confirm.val();
 
             var shouldImport = $checkImport[0].checked;
-            var doesAccept = $checkAcceptTerms[0].checked;
+            var doesAccept;
+            try {
+                // if this throws there's either a horrible bug (which someone will report)
+                // or the instance admins did not configure a terms page.
+                doesAccept = $checkAcceptTerms[0].checked;
+            } catch (err) {
+                console.error(err);
+            }
 
             if (Cred.isEmail(uname) && !I_REALLY_WANT_TO_USE_MY_EMAIL_FOR_MY_USERNAME) {
                 var emailWarning = [
@@ -94,7 +102,7 @@ define([
                 return void UI.alert(Messages.register_passwordsDontMatch);
             }
 
-            if (!doesAccept) { // do they accept the terms of service?
+            if (Pages.customURLs.terms && !doesAccept) { // do they accept the terms of service? (if they exist)
                 return void UI.alert(Messages.register_mustAcceptTerms);
             }