Make unlock() use the "new" BFA RPC API call

bin/unlock.js

@@ -60,8 +60,12 @@ function unlockall()
 {
     var     wallets             =   new Array();
     web3.bfa.personal.listWallets(
-        function pushone(x)
+        function pushone(err,x)
         {
+            if ( err )
+                bye( 1, err );
+            if ( x == undefed )
+                bye( 1, "wallets not defined" );
             var     failures    =   0;
             var     promises    =   new Array();
             var     i           =   x.length;