Fix missing empty selection in result option choices when no default value is set #2414
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Description of the issue/feature this PR addresses
This PR fixes an issue for service result variables when choices are used, no default value is given and "Allow empty" is not allowed:
Current behavior before PR
The choices in an analysis display the first result option, but it is not selected.
Therefore, the result can not be submitted.
Desired behavior after PR is merged
The choices in an analysis display an empty result option, and a valid option need to be selected manually.
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I confirm I have tested this PR thoroughly and coded it according to PEP8
and Plone's Python styleguide standards.