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>
Merge pull request #227 from cbmi/issue-226

Fix error when checking for solvebio clinvar data
Fixed flake8 issues with AssessmentTestCase

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