D27518: Only enable the "Help" button if khelpcenter is available

[Aleix Pol Gonzalez]

apol requested changes to this revision.
apol added a comment.
This revision now requires changes to proceed.


  If khelpcenter is not available, we do an openUrl that should show the documentation on your browser.

REPOSITORY
  R124 System Settings

REVISION DETAIL
  https://phabricator.kde.org/D27518

To: ahmadsamir, #plasma, apol
Cc: apol, plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, ahiemstra, mart
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