minor: add printing stack trace for error handling in sample-dataset dropbox

SVN: 19193

datastore_server/source/java/ch/systemsx/cisd/etlserver/entityregistration/SampleAndDataSetFolderProcessor.java

@@ -71,6 +71,7 @@ class SampleAndDataSetFolderProcessor extends AbstractSampleAndDataSetProcessor
                     controlFileProcessor.register();
                 } catch (UserFailureException e)
                 {
+                    e.printStackTrace();
                     errorMap.put(controlFile, e);
                 }
             }

datastore_server/source/java/ch/systemsx/cisd/etlserver/entityregistration/SampleAndDataSetRegistrationHandler.java

@@ -145,6 +145,7 @@ public class SampleAndDataSetRegistrationHandler implements IDataSetHandlerWithM
             folderProcessor.register();
         } catch (Exception ex)
         {
+            ex.printStackTrace();
             operationLog.error("Could not register samples / data sets in ", ex);
             throw new CheckedExceptionTunnel(ex);
         } finally