Fix bug in Secretariat MeetingModelForm, exclude was missing a , to be a tuple

- Legacy-Id: 6896

ietf/secr/meetings/forms.py

@@ -91,7 +91,7 @@ class TimeChoiceField(forms.ChoiceField):
 class MeetingModelForm(forms.ModelForm):
     class Meta:
         model = Meeting
-        exclude = ('type')
+        exclude = ('type',)
         
     def clean_number(self):
         number = self.cleaned_data['number']
@@ -208,4 +208,4 @@ class UploadBlueSheetForm(forms.Form):
         file = self.cleaned_data['file']
         if not re.match(r'bluesheets-\d+',file.name):
             raise forms.ValidationError('Incorrect filename format')
-        return file
+        return file