(Click to enlarge)

Worked out that this is the filename of non-bundled addons (though it clearly wasn't showing any in the screenshot). I did initially think it was the Company name, as this is missing on the description output before proceeding to add an addon (I only see this description being output for 1 addon, though both of my addons have an addon.inf and the relevant info in the addon hook files). If you uninstall an addon, the filename shows. Maybe this isn't an issue, but having every addon say N/A tells me it might be and that something is supposed to be output other than N/A (otherwise why output anything at all?)