Don't blow up when pgp signature data is '' on a package

We handled None/NULL correctly, but not the empty string. Fix this
corner case.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/main/models.py b/main/models.py
index 014464ff..42f8e89a 100644
--- a/main/models.py
+++ b/main/models.py
@@ -143,6 +143,8 @@ class Package(models.Model):
             data = b64decode(self.pgp_signature)
         except TypeError:
             return None
+        if not data:
+            return None
         data = BinaryData(data)
         packets = list(data.packets())
         return packets[0]