Add gentoolkitNonZeroExit exception

This exception should only be used when an error is not fatal and the
absence of information means no data was found.  The return_code
parameter can be used to set the exit value.

Have the equery list module when in quiet mode return an exit status of
3.  This is needed to prevent 'euse -I' from printing many 'No installed
packages matching ...' error messages.

1 files changed, 2 insertions, 0 deletions

diff --git a/bin/equery b/bin/equery
index 54c3a07..343f92d 100755
--- a/bin/equery
+++ b/bin/equery
@@ -36,6 +36,8 @@ from gentoolkit import equery, errors
 
 try:
 	equery.main()
+except errors.GentoolkitNonZeroExit as err:
+	sys.exit(err.return_code)
 except errors.GentoolkitException as err:
 	if '--debug' in sys.argv or bool(os.getenv('DEBUG', False)):
 		raise