segmentation fault when calling package depending on CUDA

When making a call to find_package() for a library depending on CUDA A segmentation fault is triggered if the calling CMakeFiles.txt project has not enabled the CUDA language

The segmentation fault is triggered in

source file: cmVisualStudio10TargetGenerator.cxx

function: bool cmVisualStudio10TargetGenerator::ComputeLinkOptions()

line 3335 with statement: switch (this->CudaOptions[config]->GetCudaRuntime()) {

because this->CudaOptions[config] is a nullptr

Currently this bug simply crashes cmake so some error handling code should be added and the user should be told to enable the CUDA language