Fix errors in IE11. Closes #2247

src/dom_components/model/Component.js

@@ -406,8 +406,9 @@ const Component = Backbone.Model.extend(Styleable).extend(
       const { opt } = this;
 
       if (em && em.getConfig('avoidInlineStyle') && !opt.temporary) {
+        const style = this.get('style') || {};
         prop = isString(prop) ? this.parseStyle(prop) : prop;
-        prop = { ...prop, ...this.get('style') };
+        prop = { ...prop, ...style };
         const state = this.get('state');
         const cc = em.get('CssComposer');
         const propOrig = this.getStyle();

src/dom_components/view/ComponentView.js

@@ -276,12 +276,14 @@ export default Backbone.View.extend({
 
     const defaultAttr = {
       'data-gjs-type': type || 'default',
-      ...(draggableComponents && { draggable: true }),
-      ...(highlightable && { 'data-highlightable': 1 }),
-      ...(textable && {
-        contenteditable: 'false',
-        'data-gjs-textable': 'true'
-      })
+      ...(draggableComponents ? { draggable: true } : {}),
+      ...(highlightable ? { 'data-highlightable': 1 } : {}),
+      ...(textable
+        ? {
+            contenteditable: 'false',
+            'data-gjs-textable': 'true'
+          }
+        : {})
     };
 
     // Remove all current attributes

src/domain_abstract/model/Styleable.js

@@ -22,7 +22,8 @@ export default {
    * @return {Object}
    */
   getStyle() {
-    return { ...this.get('style') };
+    const style = this.get('style') || {};
+    return { ...style };
   },
 
   /**