Error message when journal is corrupted, closes #22

jrnl/Journal.py

@@ -50,7 +50,11 @@ class Journal:
         if not cipher:
             return ""
         crypto = AES.new(self.key, AES.MODE_CBC, cipher[:16])
+        try:
             plain = crypto.decrypt(cipher[16:])
+        except ValueError:
+            print("ERROR: Your journal file seems to be corrupted. You do have a backup, don't you?")
+            sys.exit(-1)
         if plain[-1] != " ": # Journals are always padded
             return None
         else: