raise exception if EPICS_BASE does not exist
raise exception if EPICS_BASE does not exist

HaveF/pcaspy,tectronics/pcaspy,mscheng/pcaspy,mscheng/pcaspy,tectronics/pcaspy,paulscherrerinstitute/pcaspy,HaveF/pcaspy,paulscherrerinstitute/pcaspy,paulscherrerinstitute/pcaspy