Added src and alt attributes so template is correct and image is not filtered out (#11170).

Author: Reinmar

plugins/templates/plugin.js

@@ -77,7 +77,7 @@
  */
 CKEDITOR.config.templates_files = [
 	CKEDITOR.getUrl( 'plugins/templates/templates/default.js' )
-	];
+];
 
 /**
  * Whether the "Replace actual contents" checkbox is checked by default in the

plugins/templates/templates/default.js

@@ -16,7 +16,8 @@ CKEDITOR.addTemplates( 'default', {
 		image: 'template1.gif',
 		description: 'One main image with a title and text that surround the image.',
 		html: '<h3>' +
-			'<img style="margin-right: 10px" height="100" width="100" align="left"/>' +
+			// Use src=" " so image is not filtered out by the editor as incorrect (src is required).
+			'<img src=" " alt="" style="margin-right: 10px" height="100" width="100" align="left" />' +
 			'Type the title here' +
 			'</h3>' +
 			'<p>' +