Check sample at TQAnalysisAlgorithm init, not TQCut
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Fix provided by @okuprash but so far only used by ssWW
I'm not sure whether this is wanted centrally, but we needed that to make the unfolding work in the ssWW analysis.
Unfolding used to crash on empty (missing CollectionTree) files at the TQCut level Now check that the sample is properly initialized already at the TQAnalysisAlgorithm level. TQCut will only through a warning, and not crash.