devo verificare che l'istanza non sia None
devo verificare che l'istanza non sia None


Former-commit-id: 960748d1dec1d981c7aa234b3b34217b8227e093
barrachri/epcon,matrixise/epcon,artcz/epcon,leriomaggio/pycon_site,artcz/epcon,PythonSanSebastian/epcon,malemburg/epcon,malemburg/epcon,matrixise/epcon,pythonitalia/pycon_site,PythonSanSebastian/epcon,pythonitalia/pycon_site,leriomaggio/pycon_site,EuroPython/epcon,artcz/epcon,PythonSanSebastian/epcon,matrixise/epcon,artcz/epcon,EuroPython/epcon,matrixise/epcon,barrachri/epcon,pythonitalia/pycon_site,malemburg/epcon,malemburg/epcon,leriomaggio/pycon_site,EuroPython/epcon,matrixise/epcon,barrachri/epcon,leriomaggio/pycon_site,pythonitalia/pycon_site,artcz/epcon,PythonSanSebastian/epcon,EuroPython/epcon,PythonSanSebastian/epcon,leriomaggio/pycon_site,PythonSanSebastian/epcon,malemburg/epcon,barrachri/epcon,malemburg/epcon,artcz/epcon,barrachri/epcon,pythonitalia/pycon_site,matrixise/epcon,barrachri/epcon