Resolve unnecessary_map_or clippy lint

    warning: this `map_or` is redundant
       --> src/snapshot.rs:278:40
        |
    278 | ...                   if variants.get("None").map_or(false, Vec::is_empty) {
        |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use is_some_and instead: `variants.get("None").is_some_and(Vec::is_empty)`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_map_or
        = note: `-W clippy::unnecessary-map-or` implied by `-W clippy::all`
        = help: to override `-W clippy::all` add `#[allow(clippy::unnecessary_map_or)]`

codegen/src/snapshot.rs

@@ -275,7 +275,7 @@ fn expand_impl_body(defs: &Definitions, node: &Node, name: &str, val: &Operand)
                         for node in &defs.types {
                             if node.ident == *inner {
                                 if let Data::Enum(variants) = &node.data {
-                                    if variants.get("None").map_or(false, Vec::is_empty) {
+                                    if variants.get("None").is_some_and(Vec::is_empty) {
                                         let ty = rust_type(ty);
                                         call = quote! {
                                             match #val.#ident {