Fix EMSI session undefined, other minor cosmetic code changes

app/Classes/Protocol/EMSI.php

@@ -1173,6 +1173,8 @@ final class EMSI extends BaseProtocol implements CRCInterface,ZmodemInterface
 	{
 		Log::debug(sprintf('%s:+ wazoosend [%d]',self::LOGKEY,$zap));
 
+		$z = NULL;
+
 		// See if there is anything to add to the outbound
 		// Add our mail to the queue if we have authenticated
 		if ($this->node->aka_authed)
@@ -1186,6 +1188,6 @@ final class EMSI extends BaseProtocol implements CRCInterface,ZmodemInterface
 			}
 
 		Log::debug(sprintf('%s:- Finished sending',self::LOGKEY));
-		return ($z->zmodem_senddone()<0);
+		return (($z && $z->zmodem_senddone())<0);
 	}
 }