ad) taglib

The problem is in the second part: div.visible-xs  
https://github.com/richfaces/richfaces/blob/RF-12901-showcase/examples/bootstrap-showcase/src/main/webapp/resources/taglib.xhtml#L55

If we remove it, everything starts to work okay, so the problem must be in attributesRepeat.xhtml

https://github.com/richfaces/richfaces/blob/RF-12901-showcase/examples/bootstrap-showcase/src/main/webapp/resources/taglib.xhtml#L79

that included templates use another approach then the ones on top: attributesDataTable.xhtml
https://github.com/richfaces/richfaces/blob/RF-12901-showcase/examples/bootstrap-showcase/src/main/webapp/resources/taglib.xhtml#L34

I think the problem is with ui:repeat and as the stacktrace suggests.

I propose to minimize a sample for reproduction and report it in RF issue tracker.