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

[Aleix Pol Gonzalez]

apol added a comment.


  In D27518#615128 <https://phabricator.kde.org/D27518#615128>, @ahmadsamir wrote:
  
  > You mean open the local .docbook with kio_help to get an HTML then open it in a browser? or opening docs.kde.org e.g. https://docs.kde.org/stable5/en/kde-workspace/kcontrol/fonts/index.html ?
  
  
  This is what I mean:
  https://lxr.kde.org/source/frameworks/kguiaddons/src/util/urlhandler.cpp#0033

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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