Description of problem:
When running engine-vacuum on nonexistent table return code is 0, should be non-zero.

Version-Release number of selected component (if applicable):
ovirt-engine-4.4.1-0.1.el8ev.noarch

How reproducible:
always

Steps to Reproduce:
1. engine-vacuum -t test
2.
3.

Actual results:
shows error but returns 0

Expected results:
shows error and returns non-zero return code

Additional info:
[root@engine ~]# engine-vacuum -t test
vacuumdb: vacuuming database "engine"
vacuumdb: error: query failed: ERROR:  relation "test" does not exist
LINE 2:   VALUES ('test'::pg_catalog.regclass, NULL::pg_catalog.text...
                  ^
vacuumdb: query was: WITH listed_tables (table_oid, column_list) AS (
  VALUES ('test'::pg_catalog.regclass, NULL::pg_catalog.text)
)
SELECT c.relname, ns.nspname, listed_tables.column_list FROM pg_catalog.pg_class c
 JOIN pg_catalog.pg_namespace ns ON c.relnamespace OPERATOR(pg_catalog.=) ns.oid
 LEFT JOIN pg_catalog.pg_class t ON c.reltoastrelid OPERATOR(pg_catalog.=) t.oid
 JOIN listed_tables ON listed_tables.table_oid OPERATOR(pg_catalog.=) c.oid
 ORDER BY c.relpages DESC;
/usr/bin/engine-vacuum: line 85: ==1: command not found
[root@engine ~]# echo $?
0