[FIX] fix failure to detect models when CachedModel is missing #507
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Since we added CachedModel for 19.1. All commit that target 19.1 that were not rebased on master after adding the CachedModel were failing because we were always returning false in test_symbol_is_model because we do not find CachedModel.
However, I think it is incorrect to return false anyway, when CachedModel does not exist. Because a model can inherit from models.Model, and be fine, even before CachedModel is needed, same with TransientModel.