Log Message:
-----------
Change error message to be able to differentiate the two cases. Per suggestion
from Jaime Casanova.
Modified Files:
--------------
pgsql/src/backend/postmaster:
autovacuum.c (r1.71 -> r1.72)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/autovacuum.c?r1=1.71&r2=1.72)