Crudini should check that stdin is valid before callin sys.stdin.isatty()

[bnelsonibm]

I have a service which uses crudini to read a config file. Since my program is running as a service under systemctl, the stdin is closed. This seems to cause this exception:

File "/usr/bin/crudini", line 969, in sys.exit(main()) File "/usr/bin/crudini", line 966, in main return crudini.run() File "/usr/bin/crudini", line 831, in run if sys.stdin.isatty(): AttributeError: 'NoneType' object has no attribute 'isatty'

I think that this could be avoided if crudini would check that sys.stdin is not None before calling isatty().