Fix check and show answer for split

LMS-11237

lms/djangoapps/instructor/views/instructor_dashboard.py

@@ -13,7 +13,6 @@ from django.utils.translation import ugettext as _
 from django_future.csrf import ensure_csrf_cookie
 from django.views.decorators.cache import cache_control
 from edxmako.shortcuts import render_to_response
-from django.contrib.auth.models import User
 from django.core.urlresolvers import reverse
 from django.utils.html import escape
 from django.http import Http404, HttpResponse, HttpResponseNotFound
@@ -27,7 +26,7 @@ from xmodule.modulestore.django import modulestore
 from xblock.field_data import DictFieldData
 from xblock.fields import ScopeIds
 from courseware.access import has_access
-from courseware.courses import get_course_by_id, get_cms_course_link, get_course_with_access
+from courseware.courses import get_course_by_id, get_cms_course_link
 from django_comment_client.utils import has_forum_access
 from django_comment_common.models import FORUM_ROLE_ADMINISTRATOR
 from student.models import CourseEnrollment
@@ -35,7 +34,6 @@ from shoppingcart.models import Coupon, PaidCourseRegistration
 from course_modes.models import CourseMode, CourseModesArchive
 from student.roles import CourseFinanceAdminRole
 
-from bulk_email.models import CourseAuthorization
 from class_dashboard.dashboard_data import get_section_display_name, get_array_section_has_problem
 
 from analyticsclient.client import Client