[TIMOB-15542] iOS: BarImage - Setting a barImage property on windows crashes on SDK 3.2.0 with iOS 5.1.X

*Details:* Setting a barImage property on windows crashes on SDK 3.2.0 with iOS 5.1.X. This is a *regression* as this does not occur on SDK 3.1.3.GA. However, severity is set to Minor because [minimum iOS support for SDK 3.2.0 is 6.0.X](http://docs.appcelerator.com/titanium/3.0/#!/guide/Installing_the_iOS_SDK-section-29004875_InstallingtheiOSSDK-iOSSDK%2FTargetiOSPlatform) *Steps to reproduce:* 1. Create a new Titanium app using the app.js, barImage.png, and barImage@2x.png attachments; put barImage.png and barImage@2x.png in /Resources/iphone 2. Install app to an iOS 5.1.X device *Actual:* On launch, app will crash (see xcode_console.log). But, if you comment out the barImage property, then the app will not crash. *Expected:* App should not crash *or* a warning message should appear indicating the minimum iOS support for SDK 3.2.0.