Fix dynamic analysis specification listing error for empty excel columns #1820
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Description of the issue/feature this PR addresses
This PR fixes an error in the dynamic analysisspec listing when the excel contains empty columns
Current behavior before PR
internal server error occurs
Desired behavior after PR is merged
non string-type columns are filtered out from the folderitems
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I confirm I have tested this PR thoroughly and coded it according to PEP8
and Plone's Python styleguide standards.