Add missing initialisation of variable

Author: fgrosa

Common/Core/RecoDecay.h

@@ -699,6 +699,7 @@ struct RecoDecay {
     int8_t sgn = 0;                        // 1 if the expected mother is particle, -1 if antiparticle (w.r.t. PDGMother)
     int8_t nPiToMuLocal = 0;               // number of pion prongs decayed to a muon
     int8_t nKaToPiLocal = 0;               // number of kaon prongs decayed to a pion
+    int8_t nInteractionsWithMaterial = 0;  // number of interactions with material
     int indexMother = -1;                  // index of the mother particle
     std::vector<int> arrAllDaughtersIndex; // vector of indices of all daughters of the mother of the first provided daughter
     std::array<int, N> arrDaughtersIndex;  // array of indices of provided daughters