Print at least MSG_ERROR in case of StatusCode::FAILURE

Nicolas Koehlerrequested to merge
nkoehler/athena:atr21240 into master

Hi,

in RpcCablingCondAlg in several places a StatusCode::FAILURE was returned but only a ATH_MSG_DEBUG was printed. I moved to printing ATH_MSG_ERROR such that one knows where to look in case it happens.

Best, Nico

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