Status changes fail when the Mail Pear plugin is not installed

[Ken McLean]

On changing the audio production status to a status that triggers an email notification (eg. Pending => Approved) I get the following php error.

Warning: include_once(Net/SMTP.php) [function.include-once]: failed to open stream: No such file or directory in C:\Program Files\PHP\PEAR\Mail\smtp.php on line 206

Warning: include_once() [function.include]: Failed opening 'Net/SMTP.php' for inclusion (include_path='.;C:\Retromod\src\private\;C:\Retromod\src\public\style\;C:\Program Files\PHP\PEAR\;C:\Retromod\src\public\style\themes\default\') in C:\Program Files\PHP\PEAR\Mail\smtp.php on line 206

Warning: require_once(Net_SMTP.php) [function.require-once]: failed to open stream: No such file or directory in C:\Retromod\src\private\components\traffic\index.php on line 10

Fatal error: require_once() [function.require]: Failed opening required 'Net_SMTP.php' (include_path='.;C:\Retromod\src\private\;C:\Retromod\src\public\style\;C:\Program Files\PHP\PEAR\;C:\Retromod\src\public\style\themes\default\') in C:\Retromod\src\private\components\traffic\index.php on line 10