Fix for EMSI aborting with $rc undefined, Fix for idle nodes updates failing on updated_at column and change text used when nodes have never polled

app/Classes/Protocol/EMSI.php

@@ -929,6 +929,8 @@ final class EMSI extends BaseProtocol implements CRCInterface,ZmodemInterface
 			} catch (SocketException $e) {
 				if ($c++ > 2)
 					return self::TIMEOUT;
+				else
+					$ch = -2;
 			}
 
 			if (static::DEBUG)