Reevaluate nullable and blank columns

[mheppner]

Description
Some models have blank=True and/or null=True on CharFields. Char fields should almost never allow both null, empty values, and characters, unless there is some unique logic in the backend that is directly dependent on those distinctions.

Reproduction Steps
Steps to reproduce the problem:

1. Create a recipe type, filling out title
2. View the recipe to see the generated name field
3. Edit the recipe and delete the value from title

The recipe type will happily save with an empty title. The name field should never change after the first creation.

Expected behavior
In this case, I don't think title should ever be empty or nullable. I don't know if the backend is specifically looking for nulls or empty strings for some case (maybe some query is actually looking at those values).

Additional context
Additional validation should also be in place in the UI, I'll link that issue next.

Additionally, these models also have a similar situation:

• Batch
• DataSet
• Strike