Conditional actions in Photoshop can't test for Lab color mode.

I’m posting here because the feature request/bug report form isn’t currently working for Photoshop.
I wanted to create an action to determine if the color mode of an image is Lab, and if so, convert it to RGB. But there’s no conditional action test for Lab color mode. The list of conditions that can be tested includes RGB, grayscale, and a couple of other color modes, but not Lab, Does anyone know of a workaround? Can I get it done with scripting?
It would be a big help if the next update of Photoshop CC could include a conditional action test for Lab color mode.

This for example would convert an active Lab image to sRGB:
if (app.documents.length > 0) {
if (app.activeDocument.mode == DocumentMode.LAB) {
app.activeDocument.convertProfile ("sRGB IEC61966-2.1", Intent.RELATIVECOLORIMETRIC, true, true);

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