Fix container width fallback for DRF field

Author: codingjoe

pictures/contrib/rest_framework.py

@@ -75,7 +75,7 @@ def to_representation(self, obj: PictureFieldFile):
             try:
                 container = int(container)
             except TypeError:
-                container = None
+                container = get_settings().CONTAINER_WIDTH
             except ValueError as e:
                 raise ValueError(f"Container width is not a number: {container}") from e
             breakpoints = {

tests/contrib/test_rest_framework.py

@@ -157,7 +157,7 @@ def test_to_representation__with_aspect_ratios(
                             "700": "/media/testapp/profile/image/1/700w.webp",
                         }
                     },
-                    "media": "(min-width: 0px) and (max-width: 991px) 100vw, (min-width: 992px) and (max-width: 1199px) 33vw, 25vw",
+                    "media": "(min-width: 0px) and (max-width: 991px) 100vw, (min-width: 992px) and (max-width: 1199px) 25vw, 400px",
                 }
             },
         }
@@ -257,7 +257,7 @@ def test_to_representation__without_container(
                             "700": "/media/testapp/profile/image/16_9/700w.webp",
                         }
                     },
-                    "media": "100vw",
+                    "media": "(min-width: 0px) and (max-width: 1199px) 100vw, 1200px",
                 }
             },
         }