Control when no action is provided.

Mage/Console.php

@@ -18,6 +18,10 @@ class Mage_Console
     
     public function parse()
     {
+        if (count($this->_args) == 0) {
+            return false;
+        }
+
         if ($this->_args[0] == 'deploy') {
             $this->_action = 'deploy';
 
@@ -176,6 +180,10 @@ class Mage_Console
             case 'version';
                 $this->showVersion();
                 break;
+                
+            default:
+                Mage_Console::output('<red>Invalid action</red>', 0, 2);
+                break;
         }
         
         if ($showGrettings) {