Tweaked the decode() templatetag code slightly.

- Legacy-Id: 18482

ietf/nomcom/templatetags/nomcom_tags.py

@@ -6,7 +6,7 @@ import re
 from django import template
 from django.conf import settings
 from django.template.defaultfilters import linebreaksbr, force_escape
-from django.utils.encoding import force_text
+from django.utils.encoding import force_text, DjangoUnicodeDecodeError
 from django.utils.safestring import mark_safe
 
 import debug           # pyflakes:ignore
@@ -69,7 +69,7 @@ def decrypt(string, request, year, plain=False):
                             encrypted_file.name), key)
     try:
         out = force_text(out)
-    except Exception:
+    except DjangoUnicodeDecodeError:
         pass
     if code != 0:
         log("openssl error: %s:\n  Error %s: %s" %(command, code, error))