At the German Wikipedia, some infobox film templates, if edited with VE, would result in a duplicate, empty set of parameters being added; to see this, try and VEdit the infobox at https://de.wikipedia.org/wiki/Alles_was_kommt. Others though don't seem to show this issue, https://de.wikipedia.org/wiki/Die_5._Welle for instance. I /think/ I have narrowed the problem down to "this happens when aliases are used for the template parameters", but those all seem to be valid aliases per https://de.wikipedia.org/wiki/Vorlage:Infobox_Film/Doku .
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I think this is because https://gerrit.wikimedia.org/r/#/c/288650/ doesn't take into account suggested/required parameters that are already set under one of their alias names instead of their normal key
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Change 313545 had a related patch set uploaded (by Alex Monk):
Don't try to add suggested/required parameters already set under alias names
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Change 313545 merged by jenkins-bot:
Don't try to add suggested/required parameters already set under alias names