leave ISF unchanged if fewer than 5 ISF data points (#322)
leave ISF unchanged if fewer than 5 ISF data points (#322)

* leave ISF unchanged if fewer than 5 ISF data points

* move stuff out of the else block

openaps/oref0,PieterGit/oref0,openaps/oref0,openaps/oref0,PieterGit/oref0,PieterGit/oref0,openaps/oref0,PieterGit/oref0