Prepare SpanQueryWrapper for empty token support
diff --git a/src/main/resources/log4j.properties b/src/main/resources/log4j.properties
index 48c48d1..2ed007e 100644
--- a/src/main/resources/log4j.properties
+++ b/src/main/resources/log4j.properties
@@ -1,6 +1,6 @@
 ## logger file can be used with
 
-log4j.rootLogger = ERROR, stdout
+# log4j.rootLogger = ERROR, stdout
 
 # Spans:
 #log4j.logger.de.ids_mannheim.korap.query.spans.ElementSpans = TRACE, stdout
@@ -15,8 +15,8 @@
 #log4j.logger.de.ids_mannheim.korap.query.spans.MatchSpans = TRACE, stdout
 
 # Wrapper
-#log4j.logger.de.ids_mannheim.korap.KorapQuery = TRACE, stdout
-#log4j.logger.de.ids_mannheim.korap.query.wrap.SpanSequenceQueryWrapper = TRACE, stdout
+# log4j.logger.de.ids_mannheim.korap.KorapQuery = TRACE, stdout
+# log4j.logger.de.ids_mannheim.korap.query.wrap.SpanSequenceQueryWrapper = TRACE, stdout
 
 # Collections
 #log4j.logger.de.ids_mannheim.korap.KorapFilter = TRACE, stdout