repeat last command if empty line was entered

lib/_debugger.js

@@ -852,6 +852,13 @@ Interface.prototype.requireConnection = function() {
 // Used for debugger's commands evaluation and execution
 Interface.prototype.controlEval = function(code, context, filename, callback) {
   try {
+    // Repeat last command if empty line are going to be evaluated
+    if (this.repl.rli.history.length > 0) {
+      if (code === '(undefined\n)') {
+        code = '(' + this.repl.rli.history[0] + '\n)';
+      }
+    }
+
     var result = vm.runInContext(code, context, filename);
 
     // Repl should not ask for next command