Add a better fix for method FlowPathFlags.toString()
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/FlowPathFlags.java b/src/main/java/net/onrc/onos/ofcontroller/util/FlowPathFlags.java
index 97113ca..595eb5f 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/FlowPathFlags.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/FlowPathFlags.java
@@ -119,7 +119,9 @@
 		flagsStr += ",";
 	    flagsStr += "KEEP_ONLY_FIRST_HOP_ENTRY";
 	}
-	ret += flagsStr + "]";
+	if (flagsStr != null)
+	    ret += flagsStr;
+	ret += "]";
 
 	return ret;
     }