KProtocolInfo::icon( QString protocol ): return QString() or "unknown" if unknown?

[Friedrich W. H. Kossebau]

Hi,

who is wrong, the dox or the implementation?

The API dox of "KProtocolInfo::icon( QString protocol )" says:
	Returns:
	the icon of the protocol, or null if unknown
But the code returns "unknown" if unknown.

*http://api.kde.org/4.x-api/kdelibs-apidocs/kdecore/html/classKProtocolInfo.html#b5b8b8dabb17e0212f988eb2fbe5b113

Cheers
Friedrich
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