Check_MK Werk 6665: Checks may now yield the value None as plugin output

ID: 6665 Title: Checks may now yield the value None as plugin output Component: Checks & agents Level: 1 Class: New feature Version: 1.6.0i1 A check usually returns a state, followed by text and optional perfdata. The plugin output was not well formatted, in case yield returned an empty string. It is now possible to yield None as plugin output, which instructs the Check API to ignore this value.