Add CSV-122 to RELEASE-NOTES.txt

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1609769 13f79535-47bb-0310-9956-ffa450edef68

Author: britter

RELEASE-NOTES.txt

@@ -34,6 +34,8 @@ o CSV-48:   Predefined format for MYSQL
 FIXED BUGS
 ============
 
+o CSV-122:  NullPointerException when empty header string and and null string of "".
+            Thanks to Mike Lewis.
 o CSV-118:  CSVRecord.toMap() throws NPE on formats with no
             headers. Thanks to Enrique Lara.
 o CSV-113:  Check whether ISE/IAE are being used appropriately