Create bug link is failing for python tracebacks

This may be the same issue as bug 1197186. Clicking the Create link on the following OOPS will create an error.

http://errors.ubuntu.com/problem/9b006966434c4db556a21641f728a6ef31553a9f

Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.7/tastypie/resources.py", line 196, in wrapper
    response = callback(request, *args, **kwargs)
  File "/usr/lib/pymodules/python2.7/tastypie/resources.py", line 421, in dispatch_list
    return self.dispatch('list', request, **kwargs)
  File "/var/www/errors/errors/metrics.py", line 40, in wrapper
    result = view(*args, **kwargs)
  File "/var/www/errors/errors/api/resources.py", line 86, in dispatch
    return Resource.dispatch(self, *args, **kwargs)
  File "/usr/lib/pymodules/python2.7/tastypie/resources.py", line 454, in dispatch
    response = method(request, **kwargs)
  File "/usr/lib/pymodules/python2.7/tastypie/resources.py", line 1235, in post_list
    deserialized = self.deserialize(request, request.raw_post_data, format=request.META.get('CONTENT_TYPE', 'application/json'))
  File "/usr/lib/pymodules/python2.7/tastypie/resources.py", line 370, in deserialize
    deserialized = self._meta.serializer.deserialize(data, format=request.META.get('CONTENT_TYPE', 'application/json'))
  File "/usr/lib/pymodules/python2.7/tastypie/serializers.py", line 194, in deserialize
    deserialized = getattr(self, "from_%s" % desired_format)(content)
  File "/usr/lib/pymodules/python2.7/tastypie/serializers.py", line 344, in from_json
    return simplejson.loads(content)
  File "/usr/lib/python2.7/dist-packages/simplejson/__init__.py", line 413, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.7/dist-packages/simplejson/decoder.py", line 402, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python2.7/dist-packages/simplejson/decoder.py", line 418, in raw_decode
    obj, end = self.scan_once(s, idx)
JSONDecodeError: Invalid control character at: line 1 column 49 (char 49)

I'm pretty sure this has to do with the format of bucket / signature from errors/templates/bucket.html which is passed to errors/api/resources.py.

This also happens on the main page (https://errors.ubuntu.com/?release=Ubuntu%2014.10&package=ubuntu-release-upgrader&period=day) when you click create bug for the same bug report.