Fix NULL checks inside Win32TrayItem.
Fix NULL checks inside Win32TrayItem.

appcelerator/titanium_desktop,jvkops/titanium_desktop,wyrover/titanium_desktop,appcelerator/titanium_desktop,wyrover/titanium_desktop,jvkops/titanium_desktop,wyrover/titanium_desktop,jvkops/titanium_desktop,jvkops/titanium_desktop,appcelerator/titanium_desktop,appcelerator/titanium_desktop,jvkops/titanium_desktop,jvkops/titanium_desktop,wyrover/titanium_desktop,appcelerator/titanium_desktop,wyrover/titanium_desktop,wyrover/titanium_desktop