Checkmk Werk 8882: Fix invalid rule match analyzation in WATO

ID: 8882 Title: Fix invalid rule match analyzation in WATO Component: WATO Level: 1 Class: Bug fix Version: 1.7.0i1 The "Parameters of host/service" page and ruleset lists showed an invalid match result for rules which value evaluates to None. For binary rulesets (the ones that only have yes/no as value) the result was also not displayed correctly. The ruleset matching of Checkmk during checking was not affected by this issue.