utils: catch TypeError exception for binary logs

When a log like system.journal is passed on to aa-genprof, for
example, the user receives a TypeError exception: in method
'parse_record', argument 1 of type 'char *'

This patch catches that exception and displays a more meaningful
message.

Fixes: https://gitlab.com/apparmor/apparmor/-/issues/436
Signed-off-by: Georgia Garcia <georgia.garcia@canonical.com>

utils/apparmor/logparser.py

@@ -18,6 +18,7 @@ import sys
 import time
 
 import LibAppArmor
+import apparmor.ui as aaui
 from apparmor.common import AppArmorBug, AppArmorException, DebugLogger, hasher, open_file_read, split_name
 from apparmor.rule.capability import CapabilityRule
 from apparmor.rule.change_profile import ChangeProfileRule
@@ -274,7 +275,11 @@ class ReadLog:
         """Parse the event from log into key value pairs"""
         msg = msg.strip()
         self.debug_logger.info('parse_event: %s', msg)
+        try:
             event = LibAppArmor.parse_record(msg)
+        except TypeError:
+            aaui.UI_Important(_("WARNING: Cannot process log message, skipping entry. Make sure log is plaintext."))
+            return None
 
         ev = self.parse_record(event)
         LibAppArmor.free_record(event)