Fix error when invalidating sample with copies of analyses #1867
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Description of the issue/feature this PR addresses
This Pull Requests makes the invalidation transition aware of samples with copies of same analysis, so no error arises when creating the sample retest on invalidation.
This Pull Request ports #1866 to 2.x
Current behavior before PR
A traceback arises when invalidating a Sample with more than one copy of same analysis
Desired behavior after PR is merged
No traceback arises and the retest of the sample is created succesfully
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I confirm I have tested this PR thoroughly and coded it according to PEP8
and Plone's Python styleguide standards.