[dak/master] use discard instead of remove

[Ansgar Burchardt <ansgar@debian.org>]

Uploads that do not include source would trigger an exception when
remove is used.  discard does not raise an exception when the element
does not exist.

Signed-off-by: Ansgar Burchardt <ansgar@debian.org>
---
 daklib/checks.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/daklib/checks.py b/daklib/checks.py
index adee624..209a094 100644
--- a/daklib/checks.py
+++ b/daklib/checks.py
@@ -387,7 +387,7 @@ class ACLCheck(Check):
             raise Reject('Unknown source_acl access level {0} for fingerprint {1}'.format(source_acl.access_level, fingerprint.fingerprint))
 
         bin_architectures = set(upload.changes.architectures)
-        bin_architectures.remove('source')
+        bin_architectures.discard('source')
         binary_acl = fingerprint.binary_acl
         if binary_acl is None:
             if len(bin_architectures) > 0:
-- 
1.7.2.5