localUrl only from manifest

dapps/src/apps/app.rs

@@ -27,7 +27,7 @@ pub struct App {
 	#[serde(rename="iconUrl")]
 	pub icon_url: String,
 	#[serde(rename="localUrl")]
-	pub local_url: String,
+	pub local_url: Option<String>,
 }
 
 impl App {

dapps/src/apps/fs.rs

@@ -56,7 +56,7 @@ fn read_manifest(name: &str, mut path: PathBuf) -> EndpointInfo {
 				version: "0.0.0".into(),
 				author: "?".into(),
 				icon_url: "icon.png".into(),
-				local_url: "".into(),
+				local_url: None,
 			}
 		})
 }