due to code completion and user defined types

type MyType
  a as string
  b as string
end type

dim aa as MyType

typing
aa.b.
the last point led to crash

remaining problem
code autocorrection now shows wrong behaviour as
aa.b.
autocorrects (wrongly) to
aaaa.

Change-Id: I3e05680cd9d82f7dc124c5923f9858e22961896e
Reviewed-on: https://gerrit.libreoffice.org/17824Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>