Ruff: add and fix RET (DefectDojo#10111)

* Ruff: add RET

* Ruff: fix RET

* move docstring

Author: kiblik

dojo/announcement/views.py

@@ -81,12 +81,11 @@ def dismiss_announcement(request):
                 extra_tags="alert-success",
             )
             return HttpResponseRedirect("dashboard")
-        else:
-            messages.add_message(
-                request,
-                messages.ERROR,
-                _("Failed to remove announcement."),
-                extra_tags="alert-danger",
-            )
-            return render(request, "dojo/dismiss_announcement.html")
+        messages.add_message(
+            request,
+            messages.ERROR,
+            _("Failed to remove announcement."),
+            extra_tags="alert-danger",
+        )
+        return render(request, "dojo/dismiss_announcement.html")
     return render(request, "dojo/dismiss_announcement.html")

dojo/api_v2/mixins.py

@@ -29,8 +29,7 @@ def delete_preview(self, request, pk=None):
         def flatten(elem):
             if isinstance(elem, list):
                 return itertools.chain.from_iterable(map(flatten, elem))
-            else:
-                return [elem]
+            return [elem]
 
         rels = [
             {