Testing mapping without responses

src/viralhostrange/viralhostrangedb/forms.py

@@ -210,6 +210,10 @@ class RangeMappingForm(forms.Form):
                 ).fit(np.array(responses).reshape(-1, 1)).cluster_centers_
                 clusters = sorted([c[0] for c in clusters])
             except ModuleNotFoundError:
+                # Here when we do not have numpy
+                pass
+            except ValueError:
+                # Here when there is no data to work on
                 pass
 
         for pos, m in enumerate(models.GlobalViralHostResponseValue.objects_mappable().order_by("value")[1:], 1):

src/viralhostrange/viralhostrangedb/tests/test_views.py

@@ -2382,6 +2382,18 @@ class DataSourceRangeMappingEditTestCase(ViewTestCase):
         response = self.client.get(url)
         self.assertEqual(response.status_code, 200)
 
+    def test_works_when_empty(self):
+        self.client.force_login(self.user)
+        ds = models.DataSource.objects.create(
+            owner=self.user,
+            public=False,
+            name="public user",
+            raw_name="ee",
+            kind="FILE",
+        )
+        url = reverse('viralhostrangedb:data-source-mapping-edit', args=[ds.pk])
+        self.assertEqual(self.client.get(url).status_code, 200)
+
     def test_submit_works(self):
         url = reverse('viralhostrangedb:data-source-mapping-edit', args=[self.public_data_source_of_user.pk])
         self.client.force_login(self.user)