CC-3404: Change "Now Playing" dashboard SQL query to take advantage of the "playout_status" field in the schedule table

- Updated the logic in GetPlayOrderRange now I get the previous, current and next shows and tracks to be played.
- This information is then sent back to the caller.
	- if the previous track is null the previous show is sent back as an example of the algorithm.

airtime_mvc/application/logging/Logging.php

@@ -23,7 +23,7 @@ class Logging {
     }
     
     public static function debug($p_msg){
-        if (APPLICATION_ENV == "development"){
+        if (defined('APPLICATION_ENV') && APPLICATION_ENV == "development"){
             $logger = self::getLogger();
             $logger->debug($p_msg);            
         }