Remove default RedditError code.

This conflicts with the wiki's notion that error objects without codes
set aren't fatal.

r2/r2/controllers/multi.py

@@ -57,6 +57,9 @@ class MultiApiController(RedditController, OAuth2ResourceController):
         RedditController.pre(self)
 
     def on_validation_error(self, error):
+        if not error.code:
+            return
+
         abort(reddit_http_error(
             code=error.code,
             error_name=error.name,

r2/r2/lib/errors.py

@@ -146,7 +146,7 @@ def add_error_codes(new_codes):
 class RedditError(Exception):
     name = None
     fields = None
-    code = 400
+    code = None
 
     def __init__(self, name=None, msg_params=None, fields=None, code=None):
         Exception.__init__(self)