Fix Flakes Errors: openspending/ui/controllers/dimension.py
Fix Flakes Errors: openspending/ui/controllers/dimension.py

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