Conditions without an "otherwise" clause are handled too strict

[mrbean-bremen]

Mostly, a "required" condition also has a clause if it is allowed if the condition is not fullfilled ("may be present otherwise", "shall not be present otherwise", "may be present otherwise if...").
Sometimes this clause is omitted. This case is currently handled as "should not be present otherwise", but should be handled as "may be present otherwise" to avoid false positives.