LibWeb/SVG: Don't crash when a filter has no valid effects

Author: https://github.com/tcl3
Commit: 438bb56160
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5379
Reviewed-by: https://github.com/gmta ✅

Libraries/LibWeb/Layout/Node.cpp

@@ -653,7 +653,7 @@ void NodeWithStyle::apply_style(CSS::ComputedProperties const& computed_style)
                         return;
 
                     if (auto* filter_element = as_if<SVG::SVGFilterElement>(*maybe_filter)) {
-                        Optional<Gfx::Filter> new_filter = filter_element->gfx_filter();
+                        auto new_filter = filter_element->gfx_filter();
 
                         if (!new_filter.has_value())
                             return;