SolveBio client will raise an exception on error rather than just return None; use the Dataset resource rather than a wrapper class for querying

Signed-off-by: David Caplan <dcaplan@gmail.com>
Fix flake8 issue in allele freqs command

Signed-off-by: Don Naegely <naegelyd@gmail.com>
Fix error when checking for solvebio clinvar data

Signed-off-by: Don Naegely <naegelyd@gmail.com>
Add tests for Assessment resources

Signed-off-by: Sheik Hassan <solergiga@yahoo.com>