fix($http): don't encode URL query substring "null" to "+"

Fixes issue in encodeUriQuery used by $http and $resource that
treats null as a string and replaces the characters "null" with "+".

src/Angular.js

@@ -875,7 +875,7 @@ function encodeUriQuery(val, pctEncodeSpaces) {
              replace(/%3A/gi, ':').
              replace(/%24/g, '$').
              replace(/%2C/gi, ',').
-             replace((pctEncodeSpaces ? null : /%20/g), '+');
+             replace(/%20/g, (pctEncodeSpaces ? '%20' : '+'));
 }
 
 

src/ngResource/resource.js

@@ -300,7 +300,7 @@ angular.module('ngResource', ['ng']).
         replace(/%3A/gi, ':').
         replace(/%24/g, '$').
         replace(/%2C/gi, ',').
-        replace((pctEncodeSpaces ? null : /%20/g), '+');
+        replace(/%20/g, (pctEncodeSpaces ? '%20' : '+'));
     }
 
     function Route(template, defaults) {

test/AngularSpec.js

@@ -415,6 +415,14 @@ describe('angular', function() {
       //encode ' ' as '%20' when a flag is used
       expect(encodeUriQuery('  ', true)).
         toEqual('%20%20');
+
+      //do not encode `null` as '+' when flag is used
+      expect(encodeUriQuery('null', true)).
+        toEqual('null');
+
+      //do not encode `null` with no flag
+      expect(encodeUriQuery('null')).
+        toEqual('null');
     });
   });
 
@@ -673,7 +681,7 @@ describe('angular', function() {
           toBe('<ng-abc x="2A">');
     });
   });
-  
+
   describe('startingTag', function() {
     it('should allow passing in Nodes instead of Elements', function() {
       var txtNode = document.createTextNode('some text');
@@ -741,11 +749,11 @@ describe('angular', function() {
   describe('noConflict', function() {
     var globalAngular;
     beforeEach(function() {
-      globalAngular = angular;  
+      globalAngular = angular;
     });
 
     afterEach(function() {
-      angular = globalAngular;  
+      angular = globalAngular;
     });
 
     it('should return angular', function() {
@@ -757,7 +765,7 @@ describe('angular', function() {
       var a = angular.noConflict();
       expect(angular).toBeUndefined();
     });
-      
+
   });
 
 });

test/ngResource/resourceSpec.js

@@ -136,6 +136,12 @@ describe("resource", function() {
     R.get({a: 'doh&foo', bar: ['baz1', 'baz2']});
   });
 
+  it('should not encode string "null" to "+" in url params', function() {
+   var R = $resource('/Path/:a');
+   $httpBackend.expect('GET', '/Path/null').respond('{}');
+   R.get({a: 'null'});
+  });
+
   it('should allow relative paths in resource url', function () {
     var R = $resource(':relativePath');
     $httpBackend.expect('GET', 'data.json').respond('{}');