BradLarson/GPUImage — pull request #1037 by iamcam (2013-06-20 05:04:24+00:00)
Title: Prevent CGContextDrawImage error when empty images are passed to GPUImagePicture init

The empty image passed to GPUImagePicture will trigger this error when CGContextDrawImage is called on init::

": CGContextDrawImage: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update."

This should prevent the error altogether.