fixup! Make MessageSet the owner of FairMQMessage objects in a linear vector

Author: matthiasrichter

Framework/Core/src/DataRelayer.cxx

@@ -591,7 +591,7 @@ std::vector<o2::framework::MessageSet> DataRelayer::getInputsForTimeslice(Timesl
   // FIXME: what happens when we have enough timeslices to hit the invalid one?
   auto invalidateCacheFor = [&numInputTypes, &cachedStateMetrics = mCachedStateMetrics, &index, &cache](TimesliceSlot s) {
     for (size_t ai = s.index * numInputTypes, ae = ai + numInputTypes; ai != ae; ++ai) {
-      //assert(std::accumulate(cache[ai].begin(), cache[ai].end(), true, [](bool result, auto const& element) { return result && element.header().get() == nullptr && element.payload().get() == nullptr; }));
+      assert(std::accumulate(cache[ai].messages.begin(), cache[ai].messages.end(), true, [](bool result, auto const& element) { return result && element.get() == nullptr; }));
       cache[ai].clear();
     }
     index.markAsInvalid(s);