D11044: Don't try to find an icon for an empty url

[Jaime Torres Amate]

jtamate added a dependency: D11013: Detect incorrect paramenter in findProtocol.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D11044

To: jtamate, #frameworks, dfaure
Cc: michaelh
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