[patch] klineedit: use isEmpty()

[Jarosław Staniek]

for review: no idea why input.isNull() was used, perhaps there's a reason?

-- 
regards / pozdrawiam, Jaroslaw Staniek
  Sponsored by OpenOffice Polska (http://www.openoffice.com.pl/en) to work on
  Kexi & KOffice (http://www.kexi.pl/en, http://www.koffice.org/kexi)
  KDE Libraries for MS Windows (http://windows.kde.org)
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