fix: change URL.with_replacements to use Empty (#2482)

Author: nilsso

litestar/datastructures/url.py

@@ -200,7 +200,7 @@ def with_replacements(
         scheme: str = "",
         netloc: str = "",
         path: str = "",
-        query: str | MultiDict | None = None,
+        query: str | MultiDict | None | EmptyType = Empty,
         fragment: str = "",
     ) -> URL:
         """Create a new URL, replacing the given components.
@@ -217,12 +217,13 @@ def with_replacements(
         """
         if isinstance(query, MultiDict):
             query = urlencode(query=query)
+        query = (query if query is not Empty else self.query) or ""
 
         return URL.from_components(  # type: ignore[no-any-return]
             scheme=scheme or self.scheme,
             netloc=netloc or self.netloc,
             path=path or self.path,
-            query=query or self.query,
+            query=query,
             fragment=fragment or self.fragment,
         )
 

tests/unit/test_datastructures/test_url.py

@@ -60,6 +60,9 @@ def test_url_from_components(component: str, value: str) -> None:
         ("scheme", "http", "http"),
         ("netloc", "example.com", "example.com"),
         ("path", "/foo", "/foo"),
+        ("query", None, ""),
+        ("query", "", ""),
+        ("query", MultiDict({}), ""),
         ("query", "foo=baz", "foo=baz"),
         ("query", MultiDict({"foo": "baz"}), "foo=baz"),
         ("fragment", "anchor2", "anchor2"),