Added caller in to the exception message

Added caller in to the exception message to debug ENT-1849
Replaced `get_enterprise_learner_data` method call with `enterprise_customer_for_request` to get enterprise customer data from cache or session instead of hitting API.

lms/djangoapps/support/views/contact_us.py

@@ -40,8 +40,8 @@ class ContactUsView(View):
         if request.user.is_authenticated:
             context['course_id'] = request.session.get('course_id', '')
             context['user_enrollments'] = CourseEnrollment.enrollments_for_user_with_overviews_preload(request.user)
-            enterprise_learner_data = enterprise_api.get_enterprise_learner_data(user=request.user)
-            if enterprise_learner_data:
+            enterprise_customer = enterprise_api.enterprise_customer_for_request(request)
+            if enterprise_customer:
                 tags.append('enterprise_learner')
 
         context['tags'] = tags

openedx/features/enterprise_support/api.py

@@ -5,6 +5,7 @@ from __future__ import absolute_import
 
 import logging
 from functools import wraps
+import traceback
 
 from django.conf import settings
 from django.contrib.auth.models import User
@@ -256,9 +257,10 @@ class EnterpriseApiClient(object):
             response = endpoint().get(**querystring)
         except (HttpClientError, HttpServerError):
             LOGGER.exception(
-                u'Failed to get enterprise-learner for user [%s] with client user [%s]',
+                u'Failed to get enterprise-learner for user [%s] with client user [%s]. Caller: %s',
                 user.username,
-                self.user.username
+                self.user.username,
+                "".join(traceback.format_stack())
             )
             return None