CFBundleName nil crash FXFormFieldHeader

[rbrdev]

is CFBundleName if nil, the method FXFormClassFromString crash App.

static Class FXFormClassFromString(NSString *className)
{
Class cls = NSClassFromString(className);
if (className && !cls)
{
//might be a Swift class; time for some hackery!
className = [@[[[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleName"],
className] componentsJoinedByString:@"."];
//try again
cls = NSClassFromString(className);
}
return cls;
}