Samples without a qualifying status appear as submitted today #235
Description
When a sample does not yet have a status which allows it to be classified in a status category, the default status is "sample submitted", with today's date. This is inaccurate, and should instead be the sample created date. This creation date needs to be loaded from the database as an additional field, and then loaded in SampleInfo. It should replace the datetime.now() present in data_models.py line 134.