Checkmk Werk 13479: Commandlets of active checks and special agents may be passed None as IP address

ID: 13479 Title: Commandlets of active checks and special agents may be passed None as IP address Component: Checks & agents Level: 1 Class: New feature Version: 2.1.0i1 This werk only affects users who have implemented their own plugins for active checks or special agents (the ones commonly named <tt>checks/check_*</tt> and <tt>checks/agent_*</tt>). The functions implemented in those plugins have to a accept the IP address of the host as an argument. For hosts without an IP address they used to get passed <tt>"0.0.0.0"</tt> or <tt>"::0"</tt>. This has been changed to `None`. Since most of these functions simply pass it on in a list, this should not make any difference.