Fix options conversion

[pingu-codes]

Options is currently mapped to _options to convert "raw" options to objects with label/value for objects it uses this check
if (!op.value) op.value = op.label;
to check for ops without values however this is incorrectly flagged on a value of 0 I'd suggest the check is changed to if(op.value == undefined)

[janosh]

@GodPingu Thanks for reporting! Will be fixed in the next release.