Omit empty group labels when generating XML #227
Merged
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Goal: make formpack-to-XML conversion behave the same way as
formpack-to-XLSForm-to-XML conversion. The better those match, the
better KPI's previews will match its deployed forms.
In this particular case, pyxform discarded empty cells when loading from
XLSForm, but formpack was preserving empty strings when sending Python
structures to pyxform for conversion to XML. One consequence of this was
empty translated labels being shown for groups in KPI previews, i.e.
kobotoolbox/kpi#2707.