Roadmap gadget is blank when it tries to render a version that has no description (on Oracle)

The roadmap gadget is left blank if the time frame includes a version that has no description and JIRA is connected to Oracle.

Basically, here is what happens:

1. The user creates a Version with no description.
2. JIRA tries to save the description as "", but Oracle saves this as NULL.
3. JIRA returns a version from the roadmap REST endpoint with no description field.
4. The roadmap portlet barfs when trying to execute:

AJS.$("<td/>").addClass("versionDesc").attr("colSpan", 2).text(ver.description).appendTo(tr);

This does not seem to be a problem on databases that are able to save the "" rather than NULL.

You can use the attached XML to reproduce the problem in any database as I have manually made the description of the only version NULL.

Regards,
Brenden.