Log submission errors

apps/openassessment/xblock/submission_mixin.py

+import logging
 from xblock.core import XBlock
 from django.utils.translation import ugettext as _
 from submissions import api
@@ -5,6 +6,9 @@ from openassessment.assessment import peer_api
 from openassessment.workflow import api as workflow_api
 
 
+logger = logging.getLogger(__name__)
+
+
 class SubmissionMixin(object):
     """Submission Mixin introducing all Submission-related functionality.
 
@@ -60,6 +64,7 @@ class SubmissionMixin(object):
                 status_tag = 'EBADFORM'
                 status_text = unicode(err.field_errors)
             except (api.SubmissionError, workflow_api.AssessmentWorkflowError):
+                logger.exception("Error occurred while submitting.")
                 status_tag = 'EUNKNOWN'
             else:
                 status = True