Corrected change log

Author: gerdwagner

sql12/core/doc/changes.txt

@@ -45,7 +45,7 @@ Table cell data popup now offers find, Xml/Json-reformatting and export function
 Bug fixes:
 
 https://github.com/squirrel-sql-client/squirrel-sql-code/issues/42
-  Refactoring "Add column" raised NullPointerException.
+  Refactoring "Add column" raised "IllegalArgumentException: SQLDatabaseMetaData == null."
   See table in Object tree --> right mouse click --> Refactoring --> Column --> Add Column
 
 SQL result: When a SQL result was rerun, the SQL displayed on the result's info tab lost comments.