* In lcl_ScAddress_Parse_OOo() don't assume non-existing sheets would be
  external documents if there was no sheet separator. This lead to an
  external reference being created that is only an error if
  dereferenced, not if fed to ISERROR() and the like.
* In ScInterpreter::ScIndirect() push errNoRef instead of
  errInvalidArgument to produce a #REF! error.