PS4 Multiple device flow fails.

[ktnrg45]

Home Assistant release with the issue:
0.90

Last working Home Assistant release (if known):
0.89

Operating environment (Hass.io/Docker/Windows/etc.):

Component/platform:
PlayStation 4

Description of problem:
When adding additional device using integrations. Credentials are passed to api as None. Credentials should be the same. So fetch from existing entry.

Traceback (if applicable):
user log

Additional information: