Ensure _.at and _.pullAt work with falsey array and collection values when keys are provided.

lodash.js

@@ -3999,7 +3999,7 @@
      * // => [10, 20]
      */
     function pullAt(array) {
-      return basePullAt(array, baseFlatten(arguments, false, false, 1));
+      return basePullAt(array || [], baseFlatten(arguments, false, false, 1));
     }
 
     /**

test/test.js

@@ -953,6 +953,18 @@
       deepEqual(actual, ['d', 'a', 'c']);
     });
 
+    test('should work with a falsey `array` argument when keys are provided', 1, function() {
+      var expected = _.map(falsey, _.constant([undefined, undefined]));
+
+      var actual = _.map(falsey, function(value) {
+        try {
+          return _.at(value, 0, 1);
+        } catch(e) {}
+      });
+
+      deepEqual(actual, expected);
+    });
+
     test('should work with an `arguments` object for `collection`', 1, function() {
       var actual = _.at(args, [2, 0]);
       deepEqual(actual, ['c', 'a']);
@@ -9184,6 +9196,18 @@
       deepEqual(actual, ['d', 'a', 'c']);
     });
 
+    test('should work with a falsey `array` argument when keys are provided', 1, function() {
+      var expected = _.map(falsey, _.constant([undefined, undefined]));
+
+      var actual = _.map(falsey, function(value) {
+        try {
+          return _.pullAt(value, 0, 1);
+        } catch(e) {}
+      });
+
+      deepEqual(actual, expected);
+    });
+
     test('should ignore non-index values', 2, function() {
       var array = ['a', 'b', 'c'],
           clone = array.slice();