fix template rendering (needs to be tested in safari/ios).

fixes error reported here: https://knx-user-forum.de/forum/supportforen/cometvisu/1340694-oberfl%C3%A4chen-als-template-werden-nicht-angezeigt

(cherry picked from commit da0373a)

source/class/cv/parser/MetaParser.js

@@ -363,10 +363,11 @@ qx.Class.define("cv.parser.MetaParser", {
             }, this);
             areq.send();
           } else {
+            var cleaned = qx.bom.element.Attribute.get(elem, 'html').replace(/\n\s*/g, '').trim();
             cv.parser.WidgetParser.addTemplate(
               templateName,
               // templates can only have one single root element, so we wrap it here
-              '<root>' + qx.bom.element.Attribute.get(elem, 'html') + '</root>'
+              '<root>' + cleaned + '</root>'
             );
           }
         }, this);

source/class/cv/parser/WidgetParser.js

@@ -60,10 +60,10 @@ qx.Class.define('cv.parser.WidgetParser', {
 
         if (this.__templates.hasOwnProperty(templateName)) {
           var renderedString = qx.bom.Template.render(this.__templates[templateName], variables).replace('\n', '').trim();
-          var div = document.createElement('div');
-          qx.bom.element.Attribute.set(div, 'html', renderedString.substring(6, renderedString.length - 7).trim());
-          // replace existing element with the rendered template (without <root> </root>)
-          elem.parentNode.replaceChild(div.firstChild, elem);
+          var helperNode = elem.ownerDocument.createElement('template');
+          qx.bom.element.Attribute.set(helperNode, 'html', renderedString.substring(6, renderedString.length - 7).trim());
+          // replace existing element with the rendered templates child
+          elem.parentNode.replaceChild(helperNode.firstElementChild, elem);
         }
       }, this);
     },