[PWGDQ] Adding check if MC particle exists in mftMchMatcher

Author: Maurice Coquet

PWGDQ/Tasks/mftMchMatcher.cxx

@@ -543,6 +543,10 @@ struct mftMchMatcher {
 
     auto const& mchTrack = muonTrack.template matchMCHTrack_as<TMUONS>();
     auto const& mftTrack = muonTrack.template matchMFTTrack_as<TMFTS>();
+    
+    if (!muonTrack.has_mcParticle() || !mftTrack.has_mcParticle()) {
+      return result;
+    }
 
     bool isPaired = isPairedMuon(mchTrack.globalIndex(), matchablePairs);
     std::pair<int64_t, int64_t> matchPair{mchTrack.globalIndex(), mftTrack.globalIndex()};