[12.x] Uri prevent empty query string (#55146)

* Add broken example

* Fallback to `null` when query string is empty to remove it

Author: rojtjo

src/Illuminate/Support/Uri.php

@@ -235,7 +235,7 @@ public function withQuery(array $query, bool $merge = true): static
             }
         }
 
-        return new static($this->uri->withQuery(Arr::query($newQuery)));
+        return new static($this->uri->withQuery(Arr::query($newQuery) ?: null));
     }
 
     /**

tests/Support/SupportUriTest.php

@@ -188,4 +188,12 @@ public function test_with_query_if_missing()
             ],
         ], $uri->query()->all());
     }
+
+    public function test_with_query_prevents_empty_query_string()
+    {
+        $uri = Uri::of('https://laravel.com');
+
+        $this->assertEquals('https://laravel.com', (string) $uri);
+        $this->assertEquals('https://laravel.com', (string) $uri->withQuery([]));
+    }
 }