D27616: [UrlHandler] optimise the code and less if nesting

[Aleix Pol Gonzalez]

apol added inline comments.

INLINE COMMENTS

> ahmadsamir wrote in urlhandler.cpp:55
> I could be wrong, but this is exactly equivalent to the original code, i.e. it won't reach this unless helpcenter is empty and it's not a kde app... and I actually wanted to ask about this bit from the original code, what is it supposed to do?

I guess it was in case it wasn't found. Maybe just change into an error saying "can't open the following help url %1"  where %1 is the url

REPOSITORY
  R273 KGuiAddons

REVISION DETAIL
  https://phabricator.kde.org/D27616

To: ahmadsamir, #frameworks, apol
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
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