Tutorial3/MQ/sampler: Remove sink

Remove setting the sink.

Fixes issue #1355.

CHANGELOG.md

@@ -13,6 +13,7 @@ In the MT mode of Geant4 the folder names changed from 'folderName_1' and 'folde
 ### Bug fixes
 * Check the return value of `source->InitUnpackers()`/`source->ReinitUnpackers()`
   in `FairRunOnline`. Stop run if `false` returned.
+* Remove sink from Tutorial3/MQ/sampler.cxx.
 
 ### Other Notable Changes
 * Allow running without output sink. In this case even persistent branches would not be stored anywhere.

basemq/devices/FairMQSampler.h

@@ -19,7 +19,6 @@
 #include "FairMQ.h"   // for fair::mq::Device, fair::mq::MessagePtr
 #include "FairMQSamplerTask.h"
 #include "FairParRootFileIo.h"
-#include "FairRootFileSink.h"
 #include "FairRunAna.h"
 #include "FairRuntimeDb.h"
 
@@ -98,10 +97,6 @@ class FairMQSampler : public fair::mq::Device
 
         fFairRunAna->SetSource(source);
 
-        TString output = fInputFile;
-        output.Append(".out.root");
-        fFairRunAna->SetSink(std::make_unique<FairRootFileSink>(output.Data()));
-
         fFairRunAna->AddTask(fSamplerTask);
 
         if (fParFile != "") {