Steps:
- Edit the current company (1):
  - Country: Switzerland
  - Currency: CHF
- Install l10n_ch
- Go to Invoicing > Configuration > Bank Accounts
- Edit Bank:
  - Bank Account: create a new one:
    - Account Holder: (1)
- Go to Configuration > Journal
- Edit Customer Invoices:
  - Advanced Settings tab:
    - Communication Standards: Switzerland
- Go to Customers > Customers
- Create a new customer (2):
  - Fill in street, city, zip code and country
- Edit (2):
  - Contacts & Addresses tab:
    - Add:
      - Select Invoice Address
      - Contact Name: Keep this field blank
- Go to Customers > Invoices
- Create a new one:
  - Customer: "(2), Invoice Address"
  - Add a product
- Validate it
- Click Print QR-Bill

Bug:
Traceback here:
https://github.com/odoo/odoo/blob/b76e9ef658bde0178fa1660b6ad27b880e91632a/addons/l10n_ch/models/res_bank.py#L129


TypeError: 'bool' object is not subscriptable

Explanation:
The contact name of an address is optional. When nothing is filled in
that field, it returns `False`, hence the error.
Using the commercial company name ensures a name is put in the invoice,
even if the contact doesn't belong to a company.

opw:2447158

closes odoo/odoo#65357

Signed-off-by: backspac <backspac@users.noreply.github.com>