Write valid ProteomeXchange XML for datasets that do not have any Unimod modifications #500
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Rationale
<ModificationList>element in the XML submitted to ProteomeXchange requires at least one cvParam subelement. https://proteomecentral.proteomexchange.org/schemas/proteomeXchange-1.4.0.html#ModificationList. We can add cvParam subelements only for modifications that have a Unimod Id. XML generated for datasets that do not have any modifications with Unimod Ids fail validation on the ProteomeXchange server.Changes
<cvParam cvRef="MS" accession="MS:1002864" name="No PTMs are included in the dataset"/>