[PWGDQ] fixed match type for tracks without MC particle

In the case of tracks with no associated MC particle, the match type
was set as "undefined", while it is now correctly set as "fake".

Author: aferrero2707

PWGDQ/Tasks/mftMchMatcher.cxx

@@ -565,7 +565,9 @@ struct mftMchMatcher {
     auto const& mftTrack = muonTrack.template matchMFTTrack_as<TMFTS>();
 
     if (!muonTrack.has_mcParticle() || !mftTrack.has_mcParticle()) {
-      return result;
+      // if either the MCH or the MFT tracks are fakes (not associated to any MC particles)
+      // we consider the match as fake
+      return (isBestMatch ? kMatchTypeFakeLeading : kMatchTypeFakeNonLeading);
     }
 
     bool isPaired = isPairedMuon(mchTrack.globalIndex(), matchablePairs);