Fix Python error when ManyToMany relations didn't exist. #61
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This avoids storing an ugettext value in self.version.
It's value got parsed in
ids = [int(v) for v in self.value]causing an
int("F")call that fails.Instead, a sentinal value is introduced that can be recognized in the
code, yet output a meaningful message when it's shown to the user.
Fixes #44
This is a rebased version of #54