Better support in pretty printer when an object has null prototype

- Fixes #500

lib/jasmine-core/jasmine.js

@@ -1390,7 +1390,7 @@ getJasmineRequireObj().pp = function(j$) {
 
   PrettyPrinter.prototype.iterateObject = function(obj, fn) {
     for (var property in obj) {
-      if (!obj.hasOwnProperty(property)) { continue; }
+      if (!Object.prototype.hasOwnProperty.call(obj, property)) { continue; }
       if (property == '__Jasmine_been_here_before__') { continue; }
       fn(property, obj.__lookupGetter__ ? (!j$.util.isUndefined(obj.__lookupGetter__(property)) &&
           obj.__lookupGetter__(property) !== null) : false);

spec/core/PrettyPrintSpec.js

@@ -121,5 +121,12 @@ describe("j$.pp", function () {
 
     expect(j$.pp(obj)).toEqual("strung");
   });
+
+  it("should handle objects with null prototype", function() {
+    var obj = Object.create(null);
+    obj.foo = 'bar';
+
+    expect(j$.pp(obj)).toEqual("{ foo : 'bar' }");
+  });
 });
 

src/core/PrettyPrinter.js

@@ -47,7 +47,7 @@ getJasmineRequireObj().pp = function(j$) {
 
   PrettyPrinter.prototype.iterateObject = function(obj, fn) {
     for (var property in obj) {
-      if (!obj.hasOwnProperty(property)) { continue; }
+      if (!Object.prototype.hasOwnProperty.call(obj, property)) { continue; }
       if (property == '__Jasmine_been_here_before__') { continue; }
       fn(property, obj.__lookupGetter__ ? (!j$.util.isUndefined(obj.__lookupGetter__(property)) &&
           obj.__lookupGetter__(property) !== null) : false);