OpenCL: Fixed crash when removing non-existing kernels.
OpenCL: Fixed crash when removing non-existing kernels.


inviwo/inviwo,Sparkier/inviwo,Sparkier/inviwo,inviwo/inviwo,Sparkier/inviwo,inviwo/inviwo,inviwo/inviwo,inviwo/inviwo,Sparkier/inviwo,Sparkier/inviwo,inviwo/inviwo