Downgrade some undo-related error messages
authorRobin Gareus <robin@gareus.org>
Sat, 16 Dec 2017 14:38:02 +0000 (15:38 +0100)
committerRobin Gareus <robin@gareus.org>
Sat, 16 Dec 2017 14:38:02 +0000 (15:38 +0100)
commit46eed0328286c8cff451469f56a2a8e2c683650a
treef8769f285f720bedd007100befebd2b2a79390fd
parentca979ee606a7d9343129ed3373b8e75453b7007a
Downgrade some undo-related error messages

Missing undo isn't a error. There are valid cases for this to happen.
e.g. switching snapshots or deleting tracks or session-format changes

It's useful to know, but should not distract users showing up as "Errors"
libs/ardour/session_command.cc