Fix Flakes Errors: openspending/ui/test/functional/test_source.py
Fix Flakes Errors: openspending/ui/test/functional/test_source.py

spendb/spendb,johnjohndoe/spendb,pudo/spendb,nathanhilbert/FPA_Core,CivicVision/datahub,USStateDept/FPA_Core,johnjohndoe/spendb,pudo/spendb,johnjohndoe/spendb,spendb/spendb,pudo/spendb,CivicVision/datahub,USStateDept/FPA_Core,nathanhilbert/FPA_Core,openspending/spendb,CivicVision/datahub,openspending/spendb,openspending/spendb,nathanhilbert/FPA_Core,spendb/spendb,USStateDept/FPA_Core