fix: proper error on empty bootstrap

src/api.rs

@@ -229,6 +229,11 @@ impl QuicP2p {
         let endpoint = self.new_endpoint()?;
 
         trace!("Bootstrapping with nodes {:?}", endpoint.bootstrap_nodes());
+        if endpoint.bootstrap_nodes().is_empty() {
+            return Err(Error::Unexpected(
+                "No nodes for bootstrapping found".to_string(),
+            ));
+        }
 
         // Attempt to connect to all nodes and return the first one to succeed
         let tasks = endpoint

src/endpoint.rs

@@ -287,6 +287,12 @@ impl Endpoint {
             });
             tasks.push(task_handle);
         }
+        if tasks.is_empty() {
+            return Err(Error::Unexpected(
+                "No tasks for echo service connection".to_string(),
+            ));
+        }
+
         let (result, _) = futures::future::select_ok(tasks).await.map_err(|err| {
             log::error!("Failed to contact echo service: {}", err);
             Error::BootstrapFailure