Revert "fix(orderBy) and nit fixes"

This reverts commit f01a643.

Author: juangabreil

src/ng/filter/orderBy.js

@@ -122,7 +122,6 @@ function orderByFilter($parse){
     sortPredicate = isArray(sortPredicate) ? sortPredicate: [sortPredicate];
     if (sortPredicate.length === 0) { sortPredicate = ['+']; }
     sortPredicate = sortPredicate.map(function(predicate){
-      predicate = predicate || '';
       var descending = false, get = predicate || identity;
       if (isString(predicate)) {
         if ((predicate.charAt(0) == '+' || predicate.charAt(0) == '-')) {
@@ -131,12 +130,6 @@ function orderByFilter($parse){
         }
         if (predicate === '') {
           // Effectively no predicate was passed so we compare identity
-          if (array.some(angular.isObject)) {
-            return function () {
-              return descending ? 1 : 0;
-            };
-          }
-
           return reverseComparator(function(a, b) {
             return compare(a, b);
           }, descending);

test/ng/filter/orderBySpec.js

@@ -91,20 +91,6 @@ describe('Filter: orderBy', function() {
       .toEqualData([{"원": 31000}, {"원": 76000}, {"원": 156000}]);
   });
 
-  it('should maintain order in an array of objects when no predicate is provided', function() {
-    var array = [{a: 1}, {b: 2}, {c: 3}];
-
-    expect(orderBy(array)).toEqualData(array);
-    expect(orderBy(array, '')).toEqualData(array);
-    expect(orderBy(array, [])).toEqualData(array);
-    expect(orderBy(array, [''])).toEqualData(array);
-    expect(orderBy(array, ['+'])).toEqualData(array);
-  });
-
-  it('should inverse order in an array of objects when minus is provided without predicate', function() {
-    expect(orderBy([{a: 1}, {b: 2}, {c: 3}], ['-'])).toEqualData([{c: 3}, {b: 2}, {a: 1}]);
-  });
-
   it('should throw if quoted string predicate is quoted incorrectly', function() {
     /*jshint -W008 */
     expect(function() {