#440 created a test user, can't sign in

[Marius Andreiana]

With "file" database, I created a TestUser with empty
passwd.

Then edited preferences specifying a password
page_data/TestUser:a:1:{s:4:"pref";s:144:"a:4:{s:6:"userid";s:8:"TestUser";s:6:"passwd";s:34:"$1$SQeqS0mX$r0V5R.wZW180udvG.R9jg0";s:5:"email";s:10:"ma@epon.ro";s:13:"emailVerified";i:1;}";}

Then I can't sign in anymore.
Invalid password.

Press Cancel, try to edit a page, it shows
Author will be logged as TestUser

After clicking Save:
You are signed but not authenticated as admin

Is user management broken in version 1.3.11 rc2?