KeyError in TrainedModel when no data_info_table is defined

[chbehrens]

For a trained model table where nnfabrik references to nnfabrik.main and no data_info_table is explicitly defined

nnfabrik/nnfabrik/templates/trained_model.py

Lines 55 to 57 in 0f3e2b7

	@property
	def data_info_table(self):
	return find_object(self.nnfabrik, "DataInfo", "data_info_table")

throws a key error as it tries to find the non-existent DataInfo in nnfabrik.main. Is this wanted behavior or should there be something like setting data_info_table = None maybe combined with a warning?