Contact birthdays without a year appears as invalid

Description

In the contacts window, the birthday of contacts is shown. Google Contacts allows to specify a birthday without a year. Mailspring displays such birthday as Invalid Date , which is undesirable. It should just display the birthday without the year.

Setup

  • OS and Version: Ubuntu 20.04
  • Mailspring Version: 1.7.8

(Originally posted by asparc on GitHub.)

This will be resolved with: