Fix a race condition causing the preview part to be empty

www/code/main.js

@@ -27,6 +27,18 @@ define([
 
         var toolbar;
         var editor;
+
+        var secret = Cryptpad.getSecrets();
+        var readOnly = secret.keys && !secret.keys.editKeyStr;
+        if (!secret.keys) {
+            secret.keys = secret.key;
+        }
+
+        var onConnectError = function () {
+            Cryptpad.errorLoadingScreen(Messages.websocketError);
+        };
+
+        var andThen = function (CMeditor) {
             var $iframe = $('#pad-iframe').contents();
             var $previewContainer = $iframe.find('#previewContainer');
             var $preview = $iframe.find('#preview');
@@ -41,17 +53,6 @@ define([
                 }
             });
 
-        var secret = Cryptpad.getSecrets();
-        var readOnly = secret.keys && !secret.keys.editKeyStr;
-        if (!secret.keys) {
-            secret.keys = secret.key;
-        }
-
-        var onConnectError = function () {
-            Cryptpad.errorLoadingScreen(Messages.websocketError);
-        };
-
-        var andThen = function (CMeditor) {
             var CodeMirror = Cryptpad.createCodemirror(CMeditor, ifrw, Cryptpad);
             $iframe.find('.CodeMirror').addClass('fullPage');
             editor = CodeMirror.editor;