config: fix exception handling
config: fix exception handling

Fix:
Traceback (most recent call last):
  File "/usr/bin/engine-log-collector", line 1437, in <module>
    setup_pg_defaults()
  File "/usr/bin/engine-log-collector", line 165, in setup_pg_defaults
    pg_user = get_pg_var('admin') or pg_user
  File "/usr/bin/engine-log-collector", line 138, in get_pg_var
    if e.errno != errno.ENOENT:
NameError: global name 'e' is not defined

Change-Id: I87c5beb46a5bd8df6e01e0472db0f5dc45bfd9c1
Signed-off-by: Sandro Bonazzola <fcb014d63786651910af5db2ecc5316c668188ef@redhat.com>

oVirt/ovirt-log-collector,oVirt/ovirt-log-collector,oVirt/ovirt-log-collector