add check for wallet version

lib/src/lightwallet/data.rs

@@ -484,11 +484,11 @@ impl WalletTx {
         // Outgoing metadata was only added in version 2
         let outgoing_metadata = Vector::read(&mut reader, |r| OutgoingTxMetadata::read(r))?;
 
-        let incoming_metadata = Vector::read(&mut reader, |r| IncomingTxMetadata::read(r))?;
+        //let incoming_metadata = Vector::read(&mut reader, |r| IncomingTxMetadata::read(r))?;
 
         let full_tx_scanned = reader.read_u8()? > 0;
             
-        Ok(WalletTx{
+        let mut wallet_tx = WalletTx {
             block,
             datetime,
             txid,
@@ -497,9 +497,15 @@ impl WalletTx {
             total_shielded_value_spent,
             total_transparent_value_spent,
             outgoing_metadata,
-            incoming_metadata,
+            incoming_metadata: vec![],
             full_tx_scanned
-        })
+        };
+        if version >= 5 {
+            wallet_tx.incoming_metadata = Vector::read(&mut reader, |r| IncomingTxMetadata::read(r))?;
+        }
+
+        Ok(wallet_tx)
+
     }
 
     pub fn write<W: Write>(&self, mut writer: W) -> io::Result<()> {