fix($location): remove query args when passed in object

Query args will be removed from $location search object if they are passed in as null or undefined object properties

Closes #6565

src/ng/location.js

@@ -446,6 +446,11 @@ LocationHashbangInHtml5Url.prototype =
         if (isString(search)) {
           this.$$search = parseKeyValue(search);
         } else if (isObject(search)) {
+          // remove object undefined or null properties
+          forEach(search, function(value, key) {
+            if (value == null) delete search[key];
+          });
+
           this.$$search = search;
         } else {
           throw $locationMinErr('isrcharg',

test/ng/locationSpec.js

@@ -117,6 +117,15 @@ describe('$location', function() {
     });
 
 
+    it('search() should remove multiple parameters', function() {
+      url.search({one: 1, two: true});
+      expect(url.search()).toEqual({one: 1, two: true});
+      url.search({one: null, two: null});
+      expect(url.search()).toEqual({});
+      expect(url.absUrl()).toBe('http://www.domain.com:9877/path/b#hash');
+    });
+
+
     it('search() should handle multiple value', function() {
       url.search('a&b');
       expect(url.search()).toEqual({a: true, b: true});