Fixed bug when using SCI_LINETRANSPOSE on a blank line.
Fixed bug when using SCI_LINETRANSPOSE on a blank line.

windoze/scintilla,keperlia/foo-wsh-panel-mod.scintilla,windoze/scintilla,keperlia/foo-wsh-panel-mod.scintilla,keperlia/foo-wsh-panel-mod.scintilla,windoze/scintilla,windoze/scintilla,keperlia/foo-wsh-panel-mod.scintilla,keperlia/foo-wsh-panel-mod.scintilla,windoze/scintilla,windoze/scintilla,windoze/scintilla,keperlia/foo-wsh-panel-mod.scintilla,windoze/scintilla