c:set is a trap:

c:set is a trap:
- c:set is being executed in an other life-cycle that when h:dataTable is
  rendered
- this causes a null value always being set in the target (backing) bean
- instead you need to use ui:param within ui:include and use #{foo} for
  accessing it, even when your IDE is not showing it (as in that file's scope
  it doesn't "know" about the parameter).

Signed-off-by: Roland Häder <roland@mxchange.org>