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Helga Velroyen authored
When looking up configuration data of instances which don't exist, the code so far fails with a cryptic error messages about NoneType not having an attribute. Although actually this situation should not happen, let's at least throw an exception with a proper description. Signed-off-by: Helga Velroyen <helgav@google.com> Reviewed-by: Petr Pudlak <pudlak@google.com>
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