Update checkstyle config

- allow empty block, as long as there's some comment

Change-Id: Idbaf727220dc9b2d301dfa19a8d3e185b1a865cd
diff --git a/tools/build/conf/pom.xml b/tools/build/conf/pom.xml
index e4f8e9d..29e4dea 100644
--- a/tools/build/conf/pom.xml
+++ b/tools/build/conf/pom.xml
@@ -27,7 +27,7 @@
 
     <groupId>org.onosproject</groupId>
     <artifactId>onos-build-conf</artifactId>
-    <version>1.0</version>
+    <version>1.1</version>
     <description>Various ONOS build settings</description>
 
     <properties>