DPL Analysis: avoid spurious message at the end of the processing

This solves the issue with the dummy extra iteration which is not
needed and actually flagged as an error after 336eda1.

The current logic is nevertheless to be reviewed because it seems
to silently skip all the timeframes in a file if the first table cannot be
read.

Framework/AnalysisSupport/src/AODJAlienReaderHelpers.cxx

@@ -276,7 +276,6 @@ AlgorithmSpec AODJAlienReaderHelpers::rootFileReaderCallback()
             outputs.make<std::string>(o2) = currentFilename;
           }
         }
-
         first = false;
       }
       totalDFSent++;
@@ -287,6 +286,27 @@ AlgorithmSpec AODJAlienReaderHelpers::rootFileReaderCallback()
       // save file number and time frame
       *fileCounter = (fcnt - device.inputTimesliceId) / device.maxInputTimeslices;
       *numTF = ntf;
+
+      // Check if the next timeframe is available or
+      // if there are more files to be processed. If not, simply exit.
+      fcnt = (*fileCounter * device.maxInputTimeslices) + device.inputTimesliceId;
+      ntf = *numTF + 1;
+      auto& firstRoute = requestedTables.front();
+      auto concrete = DataSpecUtils::asConcreteDataMatcher(firstRoute.matcher);
+      auto dh = header::DataHeader(concrete.description, concrete.origin, concrete.subSpec);
+      auto fileAndFolder = didir->getFileFolder(dh, fcnt, ntf);
+      if (!fileAndFolder.file) {
+        fcnt += 1;
+        ntf = 0;
+        if (didir->atEnd(fcnt)) {
+          LOGP(info, "No input files left to read for reader {}!", device.inputTimesliceId);
+          didir->closeInputFiles();
+          monitoring.flushBuffer();
+          control.endOfStream();
+          control.readyToQuit(QuitRequest::Me);
+          return;
+        }
+      } 
     });
   })};