.

atlas/views.py

@@ -1568,8 +1568,10 @@ class CaseCollectionCreate(RevisionMixin, LoginRequiredMixin, CreateView):
 
     def get_context_data(self, **kwargs):
         context = super(CaseCollectionCreate, self).get_context_data(**kwargs)
-
-        if self.request.POST:
+        # Only bind the case formset when the POST actually contains formset data.
+        # We don't require adding cases on create, so if the template doesn't
+        # include the casedetail management fields we should skip validation.
+        if self.request.POST and "casedetail_set-TOTAL_FORMS" in self.request.POST:
             context["case_formset"] = CaseCollectionCaseFormSet(
                 self.request.POST,
                 self.request.FILES,
@@ -1589,14 +1591,19 @@ class CaseCollectionCreate(RevisionMixin, LoginRequiredMixin, CreateView):
 
         context = self.get_context_data(form=form)
         case_formset = context["case_formset"]
-        if case_formset.is_valid():
-            response = super().form_valid(form)
-            case_formset.instance = self.object
-            case_formset.save()
-            return response
-
-        else:
-            return super().form_invalid(form)
+        # If the POST included case formset data, validate and save it. Otherwise
+        # skip formset processing so creating a collection without cases redirects
+        # normally to the detail view.
+        if self.request.POST and "casedetail_set-TOTAL_FORMS" in self.request.POST:
+            if case_formset.is_valid():
+                response = super().form_valid(form)
+                case_formset.instance = self.object
+                case_formset.save()
+                return response
+            else:
+                return super().form_invalid(form)
+        # No formset data present: proceed with normal create redirect.
+        return super().form_valid(form)
 
     def get_success_url(self):
         """Redirect to the collection detail page after successful creation."""