- Fix watch expressions for array to at least point to the
  initial element.
- Return the name (which is the initial expression for the watch
  symbol group) as last resort if the evaluation fails to avoid
  obtaining "(*) 0" as expression.

Task-number: QTCREATORBUG-7408
Change-Id: Ifdf5ba59f6e18527d98b869f6a273aed283bd7da
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>