Always warn when width and height fields are missing

Closes #227

Author: jmsmkn

pictures/models.py

@@ -291,7 +291,7 @@ def _check_aspect_ratios(self):
         return errors
 
     def _check_width_height_field(self):
-        if None in self.aspect_ratios and not (self.width_field and self.height_field):
+        if not (self.width_field and self.height_field):
             return [
                 checks.Warning(
                     "width_field and height_field attributes are missing",

tests/test_models.py

@@ -825,9 +825,11 @@ def test_check_aspect_ratios(self):
         assert errors
         assert errors[0].id == "fields.E100"
 
-    def test_check_width_height_field(self):
-        assert not PictureField(aspect_ratios=["3/2"])._check_width_height_field()
-        with override_field_aspect_ratios(Profile.picture.field, [None]):
+    @pytest.mark.parametrize(
+        "aspect_ratios", (("3/2",), (None,), ("3/2", None,))
+    )
+    def test_check_width_height_field(self, aspect_ratios):
+        with override_field_aspect_ratios(Profile.picture.field, aspect_ratios):
             errors = Profile.picture.field._check_width_height_field()
         assert errors
         assert errors[0].id == "fields.E101"