check node still exists

Author: odeimaiz

services/static-webserver/client/source/class/osparc/desktop/WorkbenchView.js

@@ -752,13 +752,15 @@ qx.Class.define("osparc.desktop.WorkbenchView", {
     __iFrameChanged: function(node) {
       this.__iframePage.removeAll();
 
-      const loadingPage = node.getLoadingPage();
-      const iFrame = node.getIFrame();
-      const src = iFrame.getSource();
-      const iFrameView = (src === null || src === "about:blank") ? loadingPage : iFrame;
-      this.__iframePage.add(iFrameView, {
-        flex: 1
-      });
+      if (node) {
+        const loadingPage = node.getLoadingPage();
+        const iFrame = node.getIFrame();
+        const src = iFrame.getSource();
+        const iFrameView = (src === null || src === "about:blank") ? loadingPage : iFrame;
+        this.__iframePage.add(iFrameView, {
+          flex: 1
+        });
+      }
     },
 
     __populateSecondaryColumn: function(node) {

services/static-webserver/client/source/class/osparc/node/slideshow/NodeView.js

@@ -143,14 +143,15 @@ qx.Class.define("osparc.node.slideshow.NodeView", {
       this._iFrameLayout.removeAll();
 
       const node = this.getNode();
-
-      const loadingPage = node.getLoadingPage();
-      const iFrame = node.getIFrame();
-      const src = iFrame.getSource();
-      const iFrameView = (src === null || src === "about:blank") ? loadingPage : iFrame;
-      this._iFrameLayout.add(iFrameView, {
-        flex: 1
-      });
+      if (node) {
+        const loadingPage = node.getLoadingPage();
+        const iFrame = node.getIFrame();
+        const src = iFrame.getSource();
+        const iFrameView = (src === null || src === "about:blank") ? loadingPage : iFrame;
+        this._iFrameLayout.add(iFrameView, {
+          flex: 1
+        });
+      }
     }
   }
 });

services/static-webserver/client/source/class/osparc/viewer/NodeViewer.js

@@ -93,15 +93,16 @@ qx.Class.define("osparc.viewer.NodeViewer", {
     __iFrameChanged: function() {
       this._removeAll();
 
-      const iframeHandler = this.getNode().getIframeHandler();
-
-      const loadingPage = iframeHandler.getLoadingPage();
-      const iFrame = iframeHandler.getIFrame();
-      const src = iFrame.getSource();
-      const iFrameView = (src === null || src === "about:blank") ? loadingPage : iFrame;
-      this._add(iFrameView, {
-        flex: 1
-      });
+      if (this.getNode() && this.getNode().getIframeHandler()) {
+        const iframeHandler = this.getNode().getIframeHandler();
+        const loadingPage = iframeHandler.getLoadingPage();
+        const iFrame = iframeHandler.getIFrame();
+        const src = iFrame.getSource();
+        const iFrameView = (src === null || src === "about:blank") ? loadingPage : iFrame;
+        this._add(iFrameView, {
+          flex: 1
+        });
+      }
     },
 
     __attachSocketEventHandlers: function() {