Await schema agreement returns wrong error

[mmatczuk]

Schema is in sync no schema changes events, it detects no conflicts yet still error is returned.

15:40:56.285    INFO    backup.await_schema     Awaiting schema agreement...
15:42:56.427    INFO    backup.await_schema     Schema agreement error  {"error": "gocql: cluster schema versions not consistent: []"}
15:42:56.428    INFO    backup.await_schema     Schema agreement not reached, retrying...       {"error": "gocql: cluster schema versions not consistent: []", "wait": "16.538893946s"}
15:45:13.126    INFO    backup.await_schema     Schema agreement error  {"error": "gocql: cluster schema versions not consistent: []"}
15:45:13.126    INFO    backup.await_schema     Schema agreement not reached, retrying...       {"error": "gocql: cluster schema versions not consistent: []", "wait": "29.401847101s"}
15:47:42.684    INFO    backup.await_schema     Schema agreement error  {"error": "gocql: cluster schema versions not consistent: []"}
15:47:42.684    INFO    backup.await_schema     Schema agreement not reached, retrying...       {"error": "gocql: cluster schema versions not consistent: []", "wait": "56.135457321s"}

[mmatczuk]

It can happen when Session is closed. This is a rare case but still behaviour is not correct.