make sure that group has indeed any elements.
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@ -6668,6 +6668,9 @@ void PMsrHandler::MakeDetectorGroupingString(TString str, PIntVector &group, TSt
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str = "";
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}
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if (group.size()==0)
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return;
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UInt_t i=0, j=0;
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do {
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j = i;
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