BIS-1059: Bugfix null pointer

server-application-server/source/java/ch/ethz/sis/openbis/generic/server/xls/importer/delay/DelayedExecution.java

@@ -64,7 +64,9 @@ public class DelayedExecution
             return false;
         }
         DelayedExecution that = (DelayedExecution) o;
-        return creationOrUpdate.getClass() == that.creationOrUpdate.getClass() && identifier.equals(that.identifier);
+        return creationOrUpdate.getClass() == that.creationOrUpdate.getClass() &&
+                identifier != null &&
+                identifier.equals(that.identifier);
     }
 
     @Override