null private transactions instead of empty

web3_proxy/src/app.rs

@@ -359,10 +359,14 @@ impl Web3ProxyApp {
             .await
             .context("spawning private_rpcs")?;
 
-            // save the handle to catch any errors
-            handles.push(private_handle);
+            if private_rpcs.conns.len() == 0 {
+                None
+            } else {
+                // save the handle to catch any errors
+                handles.push(private_handle);
 
-            Some(private_rpcs)
+                Some(private_rpcs)
+            }
         };
 
         // create rate limiters

web3_proxy/src/rpcs/connections.rs

@@ -38,7 +38,7 @@ use tracing::{error, info, instrument, trace, warn};
 /// A collection of web3 connections. Sends requests either the current best server or all servers.
 #[derive(From)]
 pub struct Web3Connections {
-    pub(super) conns: HashMap<String, Arc<Web3Connection>>,
+    pub(crate) conns: HashMap<String, Arc<Web3Connection>>,
     /// any requests will be forwarded to one (or more) of these connections
     pub(super) synced_connections: ArcSwap<SyncedConnections>,
     pub(super) pending_transactions: