Workaround for nullpointer exception in SpanOrQueries

Change-Id: Ie8fc773c5cd88533bed6074ee55ff650b685049b
diff --git a/src/main/resources/log4j.properties b/src/main/resources/log4j.properties
index 78bf62e..fd0328d 100644
--- a/src/main/resources/log4j.properties
+++ b/src/main/resources/log4j.properties
@@ -1,4 +1,4 @@
-log4j.rootLogger = ERROR, stdout
+# log4j.rootLogger = ERROR, stdout
 
 # Queries:
 # log4j.logger.de.ids_mannheim.korap.query.SpanNextQuery = TRACE, stdout