Revert "Result fallback can be a function"

This reverts commit b8a07d1.

test/utility.js

@@ -297,14 +297,6 @@
     strictEqual(_.result(obj, 'a', 'failed'), undefined);
   });
 
-  test('result fallback can use a function', function() {
-    var obj = {a: [1, 2, 3]};
-    strictEqual(_.result(obj, 'b', _.constant(5)), 5);
-    strictEqual(_.result(obj, 'b', function() {
-      return this.a;
-    }), obj.a, 'called with context');
-  });
-
   test('_.templateSettings.variable', function() {
     var s = '<%=data.x%>';
     var data = {x: 'x'};

underscore.js

@@ -1269,9 +1269,9 @@
   _.result = function(object, property, fallback) {
     var value = object == null ? void 0 : object[property];
     if (value === void 0) {
-      value = fallback;
+      return fallback;
     }
-    return _.isFunction(value) ? value.call(object) : value;
+    return _.isFunction(value) ? object[property]() : value;
   };
 
   // Generate a unique integer id (unique within the entire client session).