Bug: empty 'category' in recipe data (value: None) causes exception

[jayaddison]

Steps to Reproduce

1. Using the web importer, retrieve a URL that contains schema.org metadata, but no recipeCategory information

Expected Behavior

The recipe should be added to the database without a category.

Current Behavior

An exception is raised when attempting to comma-separate the category value (which is a Python None value).

gourmand/src/gourmand/backends/db.py

Lines 1219 to 1220 in 139ca0b

	if 'category' in dic:
	cats = [v.strip() for v in dic['category'].split(',') if v]

Possible Solution

Replace 'category' in dic condition with dic.get('category') is not None (and add relevant test coverage).

Environment

• Operating System: Linux with Python 3.10
• Version or commit id: 139ca0b
• Installed as Flatpak or Python package?: N/A (discovered while running pytest tests in a Python virtualenv)

[cydanil]

Thanks for reporting this, I'm happy with the solution you propose, and I'll look into implementing it.
Do you happen to have at hand such a recipe that doesn't contain recipeCategory?

[jayaddison]

No problem - and oops, yep - I should have provided an example URL:

• https://www.purplecarrot.com/recipe/seitan-asada-tacos-with-lime-rice-radish-salsa