MB-10755: Handle the exception rather than assert

- Corrupting the access log caused LOG_VERSION
to mismatch

Change-Id: Iaf1fa6c028b72202c3cfec78db3cf433143614df
Reviewed-on: http://review.couchbase.org/35257
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>