Checkmk Werk 11728: zfsget: handle datasets with no available space correctly

ID: 11728 Title: zfsget: handle datasets with no available space correctly Component: Checks & agents Level: 1 Class: Bug fix Version: 2.0.0i2 The check plugin <tt>zfsget</tt> did not handle datasets with zero available space correctly. This resulted in incorrect output for example concerning the overall size of the dataset. This has been fixed.