Logging Confusion with New Implementaion of Mail Templates

There seem to be some logging confusions when the new mail templates has been configured for JIRA 4.4.

Here is the sample stack trace from the logs:

ERROR ServiceRunner    Mail Queue Service [velocity] RHS of #set statement is null.
Context will not be modified. templates/email/html/includes/fields/changelog.vm [line 26, column 1]

and line 26, column 1 of the changelog.vm file:

#set ($oldText = $velocityhelper.getPrettyFieldString($changeitem.getString("field"), $changeitem.getString($oldstringKey), $i18n))

So far, no critical problems were reported, but this stack trace should be handled appropriately.