D5777: Fix check for empty su command for installing as root

[Geetam Chawla]

geetamc added a comment.


  @apol Thanks, I will surely.
  But I will update the revision right now without the change as I accidentally created the diff against an older base.

REPOSITORY
  R32 KDevelop

REVISION DETAIL
  https://phabricator.kde.org/D5777

To: geetamc, apol
Cc: apol, kdevelop-devel
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