* Finally fix the empty-script removal, i.e. remove empty scripts in

* Finally fix the empty-script removal, i.e. remove empty scripts in
  any case when leaving the script inset. Before there were cases (like
  when emptying both scripts and then leaving the inset) to leave the
  script inset such that empty script were kept.
* Force a paragraph redraw when removing a script. This will remove
  the space after an inset which got the scripts removed. Moreover
  this fixes some assert because the script body might not be in the
  coordinate cache after the script inset was removed.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@22907 a592a061-630c-0410-9148-cb99ea01b6c8