Fix for #12997: Live preview breaks on reload w/out editor (#13017)

* Use _masterEditor if editor is null in HTMLDocument

* Ensure editor exists during live preview + modify unit test

* Formatting fix

Author: haslam22

src/LiveDevelopment/Documents/HTMLDocument.js

@@ -100,8 +100,13 @@ define(function HTMLDocumentModule(require, exports, module) {
      */
     HTMLDocument.prototype.getResponseData = function getResponseData(enabled) {
         var body;
-        if (this._instrumentationEnabled && this.editor) {
-            body = HTMLInstrumentation.generateInstrumentedHTML(this.editor);
+        if (this._instrumentationEnabled) {
+            if (this.editor) {
+                body = HTMLInstrumentation.generateInstrumentedHTML(this.editor);
+            } else {
+                this.doc._ensureMasterEditor();
+                body = HTMLInstrumentation.generateInstrumentedHTML(this.doc._masterEditor);
+            }
         }
 
         return {

test/spec/LiveDevelopment-test.js

@@ -1103,7 +1103,9 @@ define(function (require, exports, module) {
             it("should reload the page when editing a non-live document", function () {
                 var promise,
                     jsdoc,
-                    loadEventPromise;
+                    loadEventPromise,
+                    liveDoc,
+                    liveResponse;
 
                 runs(function () {
                     // Setup reload spy
@@ -1158,6 +1160,17 @@ define(function (require, exports, module) {
                 runs(function () {
                     expect(Inspector.Page.reload.callCount).toEqual(2);
                 });
+
+                waitForLiveDoc(tempDir + "/simple1.html", function (doc) {
+                    liveDoc = doc;
+                    liveResponse = doc.getResponseData();
+                });
+
+                runs(function () {
+                    // Make sure a reload without an editor still sends back instrumented HTML
+                    expect(liveDoc.editor).toBe(null);
+                    expect(liveResponse.body.indexOf("data-brackets-id")).not.toBe(-1);
+                });
             });
 
         });