D10989: Check for nullptr in indexForNode

[Jaime Torres Amate]

jtamate added a dependency: D11013: Remove trailing data in the protocol 
parameter in findProtocol.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D10989

To: jtamate, #frameworks, dfaure
Cc: michaelh