Fix coding style

src/ol/format/wmscapabilitiesformat.js

@@ -259,7 +259,9 @@ ol.format.WMSCapabilities.readLayer_ = function(node, objectStack) {
   var layerObject = /**  @type {Object.<string,*>} */ (ol.xml.pushParseAndPop(
       {}, ol.format.WMSCapabilities.LAYER_PARSERS_, node, objectStack));
 
-  if (goog.isDef(layerObject)) {
+  if (!goog.isDef(layerObject)) {
+    return undefined;
+  }
   var queryable =
       ol.format.XSD.readBooleanString(node.getAttribute('queryable'));
   if (!goog.isDef(queryable)) {
@@ -324,7 +326,6 @@ ol.format.WMSCapabilities.readLayer_ = function(node, objectStack) {
   });
 
   return layerObject;
-  }
 };