Bug#681085: libnet-cups-perl: Segfaults in Net::CUPS::PPD method getNextOption when enumerating options

[Alexis Bienvenüe]

The problem comes from a strlen applied to option->choices[loop].code,
that can be NULL.
Moreover, $ppd->getNextOption() returns {} instead of undef when there
is no more options.
This should be fixed with attached patch.
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