We added a check for ConnectionNotEstablished, which causes the check
to return false if there is no database available (the case in
buildkite for rake tasks like assets:precompile), this changed the
implementation from an existence check (I can connect to the database,
but the table is not present, the situation when we have created a db,
but not yet populated the schema) to an availability check (either the
db is live but the table is absent, or the db is absent, in either
case we know we can't read from the table yet).
Change table_exists? to table_available? to indicate the new
behavior and update the two call sites.
c842d1a0c6