added no connection message and changed final checkbox tooltip

closes #158 (closed) closes #157 (closed)

util/importer.py

 import json
 import os
 import readline
+import logging
 
 from util.messages import warn
 from core.models import ExamType, Feedback, Submission, SubmissionType, Test
@@ -9,6 +10,8 @@ from util.factories import GradyUserFactory
 
 import semver
 
+log = logging.getLogger(__name__)
+
 
 WELCOME = r'''
    ______               __         ____                           __
@@ -125,7 +128,10 @@ def load_hektor_json():
     exam, _ = ExamType.objects.get_or_create(**exam_data['module'])
 
     for submission_type in exam_data['submission_types']:
-        SubmissionType.objects.get_or_create(**submission_type)
+        _, created = SubmissionType.objects.update_or_create(
+            name=submission_type['name'], defaults=submission_type)
+        if not created:
+            log.warning(f"Updated submission type {submission_type}")
 
     for student in exam_data['students']:
         student_obj = user_factory.make_student(exam=exam,