QfqPage.js: do not expect page having tabs.

javascript/src/QfqPage.js

@@ -23,7 +23,25 @@ if (!QfqNS) {
             }, settings
         );
 
-        this.bsTabs = new QfqNS.BSTabs(this.settings.tabsId);
+        try {
+            this.bsTabs = new QfqNS.BSTabs(this.settings.tabsId);
+
+            var currentState = this.settings.pageState.getPageState();
+            if (currentState !== "") {
+                this.bsTabs.activateTab(currentState);
+                QfqNS.PageTitle.setSubTitle(this.bsTabs.getTabName(currentState));
+            } else {
+                this.settings.pageState.setPageState(this.bsTabs.getCurrentTab(), QfqNS.PageTitle.get());
+            }
+
+
+            this.bsTabs.addTabShowHandler(this.tabShowHandler.bind(this));
+            this.settings.pageState.addStateActivationHandler(this.popStateHandler.bind(this));
+        } catch (e) {
+            QfqNS.Log.message(e.message);
+            this.bsTabs = null;
+        }
+
         try {
             this.qfqForm = new QfqNS.QfqForm(this.settings.formId, this.settings.submitTo, this.settings.deleteUrl);
             this.qfqForm.setBsTabs(this.bsTabs);
@@ -31,17 +49,6 @@ if (!QfqNS) {
             QfqNS.Log.error(e.message);
             this.qfqForm = null;
         }
-
-        var currentState = this.settings.pageState.getPageState();
-        if (currentState !== "") {
-            this.bsTabs.activateTab(currentState);
-            QfqNS.PageTitle.setSubTitle(this.bsTabs.getTabName(currentState));
-        } else {
-            this.settings.pageState.setPageState(this.bsTabs.getCurrentTab(), QfqNS.PageTitle.get());
-        }
-
-        this.bsTabs.addTabShowHandler(this.tabShowHandler.bind(this));
-        this.settings.pageState.addStateActivationHandler(this.popStateHandler.bind(this));
     };
 
     n.QfqPage.prototype.tabShowHandler = function (bsTabs) {