Checkmk Werk 7429: pushover: fix broken error handling

ID: 7429 Title: pushover: fix broken error handling Component: Notifications Level: 2 Class: Bug fix Version: 1.7.0i1 Since its introduction in version 1.2.8 the error handling of the pushover notification script is broken. Notifications were always handled as successful even if the Pushover API returned an error. Version 1.5.0 introduced another bug that printed an error message to the notify.log for successful notifications.