CLI/ModuleCommand: helpful message with no module

'icingacli module list' gave "There is no module installed" instead
of "There is no enabled module". Fixed this, the former message is
still shown when doing 'icingacli module list installed'.

application/clicommands/ModuleCommand.php

@@ -54,7 +54,7 @@ class ModuleCommand extends Command
             $modules = $this->modules->listInstalledModules();
         }
         if (empty($modules)) {
-            echo "There are no modules installed\n";
+            echo "There are no $type modules\n";
             return;
         }
         if ($this->isVerbose) {