Resolve "list of subjects should contain columns dependent on the study"

Closes #184 (closed)

smash/web/forms/study_subject_forms.py

+import logging
 import re
 
 from django import forms
@@ -7,6 +8,8 @@ from web.forms.forms import DATETIMEPICKER_DATE_ATTRS, get_worker_from_args
 from web.models import StudySubject, Study, StudyColumns
 from web.models.constants import SCREENING_NUMBER_PREFIXES_FOR_TYPE
 
+logger = logging.getLogger(__name__)
+
 
 class StudySubjectAddForm(ModelForm):
     datetime_contact_reminder = forms.DateTimeField(label="Contact on",