No access to old testcase version for an old testplan

[quartoxuna]

If I access a testplan with testcase versions, which are older than the latest version of the testplan, it is possible, that due to the partial lazy loading of attributes, the attributes of the wrong testcase version is loaded.

Even if this is not the case, due to the longterm usage of the same testplan.testcases list within a script, there might be problems, if the link to the testcase or the testcase itself has changes (iterator pattern).