Define options

src/ol/style/atlasmanager.js

@@ -40,7 +40,7 @@ ol.style.AtlasManagerInfo;
  */
 ol.style.AtlasManager = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options || {};
 
   /**
    * The size in pixels of the latest atlas image.

src/ol/style/circlestyle.js

@@ -26,7 +26,7 @@ goog.require('ol.style.Stroke');
  */
 ol.style.Circle = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options || {};
 
   /**
    * @private

src/ol/style/fillstyle.js

@@ -16,7 +16,7 @@ goog.require('ol.structs.IHasChecksum');
  */
 ol.style.Fill = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options || {};
 
   /**
    * @private

src/ol/style/iconstyle.js

@@ -49,7 +49,7 @@ ol.style.IconOrigin = {
  */
 ol.style.Icon = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options || {};
 
   /**
    * @private

src/ol/style/strokestyle.js

@@ -21,7 +21,7 @@ goog.require('ol.structs.IHasChecksum');
  */
 ol.style.Stroke = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options || {};
 
   /**
    * @private

src/ol/style/style.js

@@ -26,7 +26,7 @@ goog.require('ol.style.Stroke');
  */
 ol.style.Style = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options || {};
 
   /**
    * @private

src/ol/style/textstyle.js

@@ -15,7 +15,7 @@ goog.require('ol.style.Fill');
  */
 ol.style.Text = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options || {};
 
   /**
    * @private