CC-2595 : Apache error when addWatchedDir() from MusicDir.php is called

need to make this work for new installs.

airtime_mvc/application/models/MusicDir.php

@@ -150,6 +150,9 @@ class MusicDir {
                ->filterByType('link')
                ->findOne();
 
+            //see if any linked files exist.
+            if (isset($propel_link_dir)) {
+
                 //newly added watched directory object
                 $propel_new_watch = CcMusicDirsQuery::create()
                    ->filterByDirectory(realpath($p_path)."/")
@@ -177,6 +180,7 @@ class MusicDir {
                         $link_file->save();
                     }
                 }
+            }
 
             $data = array();
             $data["directory"] = $p_path;