[Common] Add missing MultSelection for derived data option

Author: ddobrigk

Common/Tools/MultModule.h

@@ -761,6 +761,12 @@ class MultModule
       cursors.tableZDC(mults.multZNA, mults.multZNC, mults.multZEM1, mults.multZEM2, mults.multZPA, mults.multZPC);
     }
 
+    //_______________________________________________________________________
+    // fill selections (for posterior derived analysis if requested)
+    if (internalOpts.mEnabledTables[kMultSelections]) {
+      cursors.multSelections(collision.selection_raw());
+    }
+
     //_______________________________________________________________________
     // vertex-Z equalized signals
     if (internalOpts.mEnabledTables[kFV0MultZeqs]) {