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

[Geetam Chawla]

geetamc created this revision.
Restricted Application added a subscriber: kdevelop-devel.

REVISION SUMMARY
  -The qstring suCommand is checked for emptiness instead of qstringlist "suCommandWithArg".
  (Reason: when an empty qstring is split, the returned_qstringlist.isEmpty() is False)
  
  -Added a default value for suCommand in makebuilderconfig.kcfg so that when new projects are
  created, the entry suCommand isn't empty.

REPOSITORY
  R32 KDevelop

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

AFFECTED FILES
  projectbuilders/makebuilder/makebuilderconfig.kcfg
  projectbuilders/makebuilder/makejob.cpp

To: geetamc
Cc: kdevelop-devel
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