[ONOS-5307], [ONOS-5372], [ONOS-5373], [ONOS-5399] defect fix

Change-Id: I9a58286a36c72c6ae3752d35ad815aba34710833
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/yob/YobConstants.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/yob/YobConstants.java
index 3b8d728..6ed14267 100644
--- a/apps/yms/app/src/main/java/org/onosproject/yms/app/yob/YobConstants.java
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/yob/YobConstants.java
@@ -34,6 +34,7 @@
     static final String OP_TYPE = "OnosYangNodeOperationType";
     static final String OF = "of";
     static final String PERIOD = ".";
+    static final String SPACE = " ";
     static final String ADD_AUGMENT_METHOD = "addYangAugmentedInfo";
 
     //Error strings