Course export page will not be opened for course id that does not belong to any course.

cms/djangoapps/contentstore/views/import_export.py

@@ -16,7 +16,7 @@ from django.contrib.auth.decorators import login_required
 from django.core.exceptions import SuspiciousOperation, PermissionDenied
 from django.core.files.temp import NamedTemporaryFile
 from django.core.servers.basehttp import FileWrapper
-from django.http import HttpResponse, HttpResponseNotFound
+from django.http import HttpResponse, HttpResponseNotFound, Http404
 from django.utils.translation import ugettext as _
 from django.views.decorators.csrf import ensure_csrf_cookie
 from django.views.decorators.http import require_http_methods, require_GET
@@ -489,6 +489,8 @@ def export_handler(request, course_key_string):
         }
     else:
         courselike_module = modulestore().get_course(course_key)
+        if courselike_module is None:
+            raise Http404
         context = {
             'context_course': courselike_module,
             'courselike_home_url': reverse_course_url("course_handler", course_key),

cms/djangoapps/contentstore/views/tests/test_import_export.py

@@ -510,6 +510,7 @@ class ImportTestCase(CourseTestCase):
 
 
 @override_settings(CONTENTSTORE=TEST_DATA_CONTENTSTORE)
+@ddt.ddt
 class ExportTestCase(CourseTestCase):
     """
     Tests for export_handler.
@@ -630,6 +631,17 @@ class ExportTestCase(CourseTestCase):
 
         self.test_export_targz_urlparam()
 
+    @ddt.data(
+        '/export/non.1/existence_1/Run_1',  # For mongo
+        '/export/course-v1:non1+existence1+Run1',  # For split
+    )
+    def test_export_course_doest_not_exist(self, url):
+        """
+        Export failure if course is not exist
+        """
+        resp = self.client.get_html(url)
+        self.assertEquals(resp.status_code, 404)
+
 
 @override_settings(CONTENTSTORE=TEST_DATA_CONTENTSTORE)
 class TestLibraryImportExport(CourseTestCase):