tooltip of the project portlets priority bar is wrong for issues with no priority

The tooltip on the project portlets open issues bar (by priority) is wrong (for issues with no priority only).

The attached screenshot shows the tooltip:

50 - 1% ({2} issues)

It appears that the getText() is missing the priorities name param and so the params to the MessageFormat is shifted left by one.
Should display

None - 50% (1 issues)