Reordering to get rid of empty waveform containers

Reordering to get rid of empty waveform containers

Waveform/WaveRecAlgs/src/PseudoCaloHitToWaveformRecAlg.cxx

@@ -42,12 +42,6 @@ PseudoCaloHitToWaveformRecAlg::execute(const EventContext& ctx) const {
   ATH_CHECK( caloHitHandle.isValid() );
   ATH_MSG_DEBUG("Found ReadHandle for CaloHitCollection " << m_caloHitContainerKey);
 
-  if (caloHitHandle->size() == 0) {
-    ATH_MSG_DEBUG("CaloHitCollection found with zero length!");
-    return StatusCode::SUCCESS;
-  }
-
-
   // Find the output waveform container
   SG::WriteHandle<xAOD::WaveformHitContainer> waveformHitContainerHandle(m_waveformHitContainerKey, ctx);
   ATH_CHECK( waveformHitContainerHandle.record( std::make_unique<xAOD::WaveformHitContainer>(),
@@ -55,6 +49,10 @@ PseudoCaloHitToWaveformRecAlg::execute(const EventContext& ctx) const {
 
   ATH_MSG_DEBUG("WaveformsHitContainer '" << waveformHitContainerHandle.name() << "' initialized");
 
+  if (caloHitHandle->size() == 0) {
+    ATH_MSG_DEBUG("CaloHitCollection found with zero length!");
+    return StatusCode::SUCCESS;
+  }
 
   // "Reconstruct" the hits
   CHECK( m_recoTool->reconstruct<CaloHitCollection>(caloHitHandle.ptr(),