Check_MK Werk 4182: mysql_slave: fixed crash if agent output is empty

ID: 4182 Title: mysql_slave: fixed crash if agent output is empty Component: Checks & Agents Level: 1 Class: Bug Fix Version: 1.4.0i4 The check will not crash anymore if the agent output does not contain data for this check. The given state will still be UNKNOWN but with more comprehensible information like "Item not found in agent output".