Not possible to omit date of birth

[autermann]

It's not possible to omit the date of birth in the profile view. A subsequent update will result in the following exception:

vendor.js:5 TypeError: Cannot read property 'getFullYear' of null
    at f.e.updateUserDetails (app.js:15)
    at fn (eval at compile (vendor.js:7), <anonymous>:4:171)
    at r (vendor.js:8)
    at f.$eval (vendor.js:6)
    at f.$apply (vendor.js:6)
    at HTMLButtonElement.<anonymous> (vendor.js:8)
    at HTMLButtonElement.dispatch (vendor.js:2)
    at HTMLButtonElement.g.handle (vendor.js:2)