Handle correspondences not set
improve compatibility with new nvidia GPUs (resolves #880)
Merge pull request #1030 from MichaelKorn/cuda

improve compatibility with new nvidia GPUs (resolves #880)
Merge branch 'ensenso_pr' of github.com:VictorLamoine/pcl
Merge branch 'correspondences' of github.com:VictorLamoine/pcl