D24912: Exit the program with an error when --add or --add-to are used without urls arguments

[Méven Car]

meven created this revision.
meven added a reviewer: elvisangelaccio.
Herald added subscribers: Ark, kde-utils-devel.
Herald added a project: Ark.
meven requested review of this revision.

REVISION SUMMARY
  Without this, ark crashes with the same conditions.

TEST PLAN
  ark --add --dialog

REPOSITORY
  R36 Ark

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D24912

AFFECTED FILES
  app/main.cpp

To: meven, elvisangelaccio
Cc: kde-utils-devel, #ark, fbampaloukas, tctara
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