13326239: UICollectionView crashes in -performBatchUpdates: when header view is nil

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Description

Summary:
UICollectionView crashes in -performBatchUpdates: when header view is nil

Steps to Reproduce:

1. Run the attached project in the simulator

Or

1. Set a header size in UICollectionView, but don't provide a supplementary view
2. Invoke -performBatchUpdates with an empty block

Expected Results:
Leaves space for a header view without actually drawing it. This is identical to what would happen if you don't call -performBatchUpdates.

Actual Results:
* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* setObjectForKey: object cannot be nil (key: <_UICollectionViewItemKey: 0x109440b0> Type = SV Kind = UICollectionElementKindSectionHeader IndexPath = <NSIndexPath 0x10944080> 2 indexes [0, 0])'

• thread 22108400: Swift 2.0b4: Allow if let and guard let to assign to self in failable value type initializers #1: tid = 0x1f03, 0x010d0e52 libobjc.A.dylibobjc_exception_throw, stop reason = breakpoint 1.3 frame #0: 0x010d0e52 libobjc.A.dylibobjc_exception_throw
  frame 22108400: Swift 2.0b4: Allow if let and guard let to assign to self in failable value type initializers #1: 0x01d160de CoreFoundation-[__NSDictionaryM setObject:forKey:] + 158 frame #2: 0x00515aa0 UIKit-[UICollectionView _setVisibleSupplementaryView:forKind:indexPath:] + 93
  frame 22108354: Swift 2.0b4: Curried initializer syntax #3: 0x005258f9 UIKit-[UICollectionView _viewAnimationsForCurrentUpdate] + 6745 frame #4: 0x005266f8 UIKit-[UICollectionView _updateWithItems:] + 1615
  frame 22108118: Apple Music: No Love Icon On CarPlay #5: 0x00523bdb UIKit-[UICollectionView _endItemAnimations] + 13286 frame #6: 0x005275f5 UIKit-[UICollectionView _endUpdates] + 48
  frame 22107493: Xocde 7, can't run playground. Unable to create target for stub executable. unable to find executable for #7: 0x005276b9 UIKit-[UICollectionView performBatchUpdates:completion:] + 191 frame #8: 0x00003627 UICollectionViewBug-[ViewController setItems:](self=0x075504c0, _cmd=0x005bce1d, items=0x07551190) + 231 at ViewController.m:59
  frame 22107374: Xcode should mark debugging messages originating from the main thread #9: 0x0000322f UICollectionViewBug-[ViewController viewDidLoad](self=0x075504c0, _cmd=0x005c7a77) + 463 at ViewController.m:34 frame #10: 0x000f61c7 UIKit-[UIViewController loadViewIfRequired] + 536
  frame 22106545: automaticallyAdjustsScrollViewInsets doesn't change insets on iOS 9 #11: 0x000f6232 UIKit-[UIViewController view] + 33 frame #12: 0x000453d5 UIKit-[UIWindow addRootViewControllerViewIfPossible] + 66
  frame 22105831: Application windows move erratically with two monitors #13: 0x0004576f UIKit-[UIWindow _setHidden:forced:] + 368 frame #14: 0x00045905 UIKit-[UIWindow _orderFrontWithoutMakingKey] + 49
  frame 22104678: Xcode7-beta4 (7A165t): libtool does not support -ios_version_min link editor flag #15: 0x0004e917 UIKit-[UIWindow makeKeyAndVisible] + 65 frame #16: 0x00002c55 UICollectionViewBug-[AppDelegate application:didFinishLaunchingWithOptions:](self=0x0754ada0, _cmd=0x005abc21, application=0x07649cf0, launchOptions=0x00000000) + 661 at AppDelegate.m:21
  frame 22103812: TestFlight does not support yet apps with watchOS 2 #17: 0x00012157 UIKit-[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 266 frame #18: 0x00012747 UIKit-[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1248
  frame 22102418: El Capitan Terminal password autofill suggestion #19: 0x0001394b UIKit-[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 805 frame #20: 0x00024cb5 UIKit-[UIApplication handleEvent:withNewEvent:] + 1022
  frame 22100305: Safari does not see my valid Safari Developer cert #21: 0x00025beb UIKit-[UIApplication sendEvent:] + 85 frame #22: 0x00017698 UIKit_UIApplicationHandleEvent + 9874
  frame 22098225: Add indexOfObject:inSortedRange:options:usingComparator: method in Swift Array #23: 0x01beedf9 GraphicsServices_PurpleEventCallback + 339 frame #24: 0x01beead0 GraphicsServicesPurpleEventCallback + 46
  frame 22095844: There's no reminder if you forget to unlock your watch #25: 0x01c08bf5 CoreFoundation__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53 frame #26: 0x01c08962 CoreFoundation__CFRunLoopDoSource1 + 146
  frame 22094327: Mac OS X 10.10.4: Managing Gatekeeper's automated re-enable via a management profile #27: 0x01c39bb6 CoreFoundation__CFRunLoopRun + 2118 frame #28: 0x01c38f44 CoreFoundationCFRunLoopRunSpecific + 276
  frame 22092373: Code Coverage is not accurately reported for code in Embedded Framework #29: 0x01c38e1b CoreFoundationCFRunLoopRunInMode + 123 frame #30: 0x0001317a UIKit-[UIApplication _run] + 774
  frame 22091468: Photos has issues playing certain videos that have been imported #31: 0x00014ffc UIKitUIApplicationMain + 1211 frame #32: 0x0000298d UICollectionViewBugmain(argc=1, argv=0xbffff364) + 141 at main.m:16
  frame 22090264: The first proposal of Spotlights search-results should not change the first proposal as long as the following keystrokes still match the first proposal #33: 0x000028b5 UICollectionViewBug`start + 53

Regression:
The results occur on iOS 6.1.

Notes:
In ViewController.m, set WANT_CRASH to 0 to skip the call to -performBatchUpdates:, which prevents the crash.

Product Version: 6.1
Created: 2013-03-01T19:34:44.648782
Originated: 2013-03-01T00:00:00
Open Radar Link: http://www.openradar.me/13326239