Merge branch 'fixArchivingStartJSON' into 'master'

fix empty modes with StartArchivingJSON

See merge request !5

archivingmanager/src/main/java/org/tango/archiving/server/manager/TimeseriesAccess.java

@@ -90,6 +90,7 @@ public class TimeseriesAccess implements IArchivingAccess {
         } catch (JsonProcessingException e) {
             throw new RuntimeException(e);
         }
+
         ArchivingConfigs configs = new ArchivingConfigs();
         for (ArchivingStartConfig conf : jsonConfig) {
             ArchivingConfig archivingConfig = new ArchivingConfig();
@@ -109,6 +110,10 @@ public class TimeseriesAccess implements IArchivingAccess {
                 modes.setContextId(contextId);
             }
             archivingConfig.setModes(modes);
+            if (!(modes.isPeriodic() || modes.isEvent())){ // Safeguard against "empty modes"
+                logger.info("Attribute {} has no periodic or event mode, it will not be archived", fullAttributeName);
+                continue;
+            }
             configs.addConfiguration(archivingConfig);
         }
         service.startArchiving(configs);