Revise error handling in NonDSampling::compute_distribution_mappings() for case when compute_mappings() has not been invoked.  See comments for current rationale.
Revise error handling in NonDSampling::compute_distribution_mappings() for
case when compute_mappings() has not been invoked.  See comments for current
rationale.


git-svn-id: c6750f7dd89925e309f580f56430152d063ff36c@1167 aa0779c3-6ec2-4b84-a212-a405c134cd8d

pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA