fix(ngTouch): check if tapElement.blur is a function

On IE Edge and apparently old Firefox mobile (see angular#13272),
SVG elements do not have a blur function

Author: Narretz

src/ngTouch/directive/ngClick.js

@@ -257,7 +257,7 @@ var ngTouchClickDirectiveFactory = ['$parse', '$timeout', '$rootElement',
         // Blur the focused element (the button, probably) before firing the callback.
         // This doesn't work perfectly on Android Chrome, but seems to work elsewhere.
         // I couldn't get anything to work reliably on Android Chrome.
-        if (tapElement) {
+        if (tapElement && angular.isFunction(tapElement.blur)) {
           tapElement.blur();
         }
 

test/ngTouch/directive/ngClickSpec.js

@@ -608,6 +608,17 @@ describe('ngClick (touch)', function() {
 
           expect(blurSpy).toHaveBeenCalled();
         });
+
+        it('should not complain when blur is not a function', function() {
+          otherElement.blur = null;
+          touch(otherElement, 10, 10);
+
+          time = 500;
+          expect(function() {
+            click(label, 10, 10);
+          }).not.toThrow();
+        });
+
       });
     });