Wavereco bugfix

Added protection for zero-length waveform RDO containers. This fixes problems writing RDOs out, but also adds protection to the waveform reconstruction code to avoid reco crashes.

Tested on vertical cosmic data and full FASER cosmic data.

Pipeline was still running when I submitted this, but you should be able to merge when it is completed.

Scintillator/ScintEventCnv/ScintByteStream/src/ScintWaveformDecoderTool.cxx

@@ -100,11 +100,11 @@ ScintWaveformDecoderTool::convert(const DAQFormats::EventFull* re,
   }
 
   if (!digitizer) {
-    ATH_MSG_ERROR("Failed to find TLB fragment in raw event!");
-    return StatusCode::FAILURE;
+    ATH_MSG_WARNING("Failed to find digitizer fragment in raw event!");
+    return StatusCode::SUCCESS;
   }
 
-  // Check validity here
+  // Check validity here, try to continue, as perhaps not all channels are bad
   if (!digitizer->valid()) {
     ATH_MSG_WARNING("Found invalid digitizer fragment:\n" << *digitizer);
   } else {