BUSINESS ACCOUNTS: breaks completely when ordering from more than 1 restaurant

[Paul-Eraman-CoopCycle]

When making a multi-restaurant order. when adding a product from the second restaurant:

1. it loads, then stops loading (indicating all is well) BUT it does not appear on the menu on the right OR
2. it loads and never stops AND
3. if situation #1, clicking on the "order" button breaks everything

[vladimir-8]

For now we will not allow ordering from more than one restaurant from the same cart