fix: remove Option from model listing return types, propagate errors (#7074)

Signed-off-by: Adrian Cole <adrian@tetrate.io>

crates/goose-cli/src/commands/configure.rs

@@ -691,15 +691,15 @@ pub async fn configure_provider_dialog() -> anyhow::Result<bool> {
     };
     spin.stop(style("Model fetch complete").green());
 
-    // Select a model: on fetch error show styled error and abort; if Some(models), show list; if None, free-text input
+    // Select a model: on fetch error show styled error and abort; if models available, show list; otherwise free-text input
     let model: String = match models_res {
         Err(e) => {
             // Provider hook error
             cliclack::outro(style(e.to_string()).on_red().white())?;
             return Ok(false);
         }
-        Ok(Some(models)) => select_model_from_list(&models, provider_meta)?,
-        Ok(None) => {
+        Ok(models) if !models.is_empty() => select_model_from_list(&models, provider_meta)?,
+        Ok(_) => {
             let default_model =
                 std::env::var("GOOSE_MODEL").unwrap_or(provider_meta.default_model.clone());
             cliclack::input("Enter a model from that provider:")