Impossible to add/save existing content tile

[boulch]

When I try to add existing content tile, if plone.app.standardtiles.content_views is empty, the field view_template (display mode) is never valid because of :

plone.app.standardtiles/src/plone/app/standardtiles/existingcontent.py

Line 272 in 4579cb8

voc = [SimpleVocabulary.createTerm("", "", "Default view")]

Field is required but value is always empty.

In the following code, we check if view_template is empty to get default view (context.getLayout) :

plone.app.standardtiles/src/plone/app/standardtiles/existingcontent.py

Line 177 in 4579cb8

view_name = self.data.get("view_template") or context.getLayout()

To fix that, IMHO, the field view_template must not be required here :

plone.app.standardtiles/src/plone/app/standardtiles/existingcontent.py

Lines 125 to 129 in 4579cb8

	view_template = schema.Choice(
	title=_("Display mode"),
	source=_("Available Content Views"),
	required=True,
	)