bug fix, anche una stringa e' iterabile
bug fix, anche una stringa e' iterabile

yakky/conference,matrixise/epcon,PythonSanSebastian/epcon,artcz/epcon,PythonSanSebastian/conference,barrachri/epcon,malemburg/epcon,matrixise/epcon,pythonitalia/conference,barrachri/epcon,malemburg/epcon,barrachri/epcon,artcz/epcon,EuroPython/epcon,PythonSanSebastian/epcon,malemburg/epcon,barrachri/epcon,EuroPython/epcon,PythonSanSebastian/conference,pythonitalia/conference,artcz/epcon,artcz/epcon,matrixise/epcon,PythonSanSebastian/epcon,EuroPython/epcon,pythonitalia/conference,matrixise/epcon,PythonSanSebastian/epcon,artcz/epcon,barrachri/epcon,matrixise/epcon,PythonSanSebastian/epcon,matrixise/epcon,malemburg/epcon,PythonSanSebastian/epcon,barrachri/epcon,malemburg/epcon,artcz/epcon,EuroPython/epcon,yakky/conference,malemburg/epcon,PythonSanSebastian/conference