Fixes Flake8 issue.
Fixes Flake8 issue.

macieksmuga/server,david4096/ga4gh-server,UMMS-Biocore/ga4gh-server,ekalosak/server,diekhans/ga4gh-server,shajoezhu/server,david4096/ga4gh-server,ohsu-computational-biology/server,pcingola/server,macieksmuga/server,dcolligan/server,hjellinek/server,ga4gh/server,UMMS-Biocore/ga4gh-server,srblum/hackathon-server,srblum/server,ekalosak/server,diekhans/ga4gh-server,ohsu-computational-biology/server,srblum/server,saupchurch/server,ga4gh/server,ga4gh/server,david4096/ga4gh-server,macieksmuga/server,hjellinek/server,pcingola/server,ohsu-computational-biology/server,srblum/hackathon-server,saupchurch/server,srblum/server,dcolligan/server,adamnovak/server,pansapiens/server,pansapiens/server,pansapiens/server,ekalosak/server,hjellinek/server,pcingola/server,srblum/hackathon-server,adamnovak/server,adamnovak/server,shajoezhu/server,UMMS-Biocore/ga4gh-server,dcolligan/server,saupchurch/server,diekhans/ga4gh-server