Allow passing test witout examples.

Not sure how to have examples run in parse-time.

crates/nu-command/src/path/const.rs

@@ -13,6 +13,7 @@ impl Command for SubCommand {
     fn signature(&self) -> Signature {
         Signature::build("path const")
             .input_output_type(Type::Nothing, Type::String)
+            .allow_variants_without_examples(true)
             .optional(
                 "path",
                 SyntaxShape::Filepath,