app: do not raise a warning when failing to deserialize symmetry...
... parasite. Not sure if that should be considered a bug. On one hand, it should because that's core code. On the other hand, symmetry saving currently uses parasites, which is a feature which can also be used by people randomly. So "theoretically", there could be any data in a parasite and we should not assume specific format. Anyway still keep the error message but just print to standard error output instead. Also print a bit more details (parasite name and contents) as it would help for debugging when such a case were to occur.
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