keyrings not displayed in 2.27.5

[Matthias Clasen <matthias clasen gmail com>]

With seahorse 2.27.5, I do not see my keyrings anymore.

This warning might be related:

** (seahorse:20589): WARNING **: could not find widget password-tab
for seahorse-key-manager.xml

** (seahorse:20589): CRITICAL **: initialize_tab: assertion
`self->pv->tabs[tabid].widget != NULL' failed

It seems that the password-tab is no longer present in the .xml file,
but seahorse still tries to load the keyring contents there...