bug report and fix

if use this cmd 
scanner 192.168.1.1/32 -t 2
will return error

Traceback (most recent call last):
    for ip in iplist:
TypeError: 'NoneType' object is not iterable

in line 321
if subnet == 32:
  print bin2ip(baseIP)

en,it's that ?
i fix it 
if subnet == 32:
        ip =  bin2ip(baseIP)
        cidrlist.append(ip)
        return cidrlist
