Multi-Sub in Blend material causing "Unsupported Material"

[Midge]

Hi guys,

Found a small bug.
Whenever you add a multi-sub material to one of the Blend's material slots, the multi-sub material becomes unsupported.
I've added a screenshot of the problem below. Problem persists in 1.00.01.

[Stan_But]

Some more extra info
This happen when multisub setted only as first material in blend
I reported it in Matnis

[Ondra]

Multimaterial is parsed entirely differently from other materials, so it does not work nested in various shaders. It is a known issue.

I added a more specific error message to be displayed instead of "Unsupported material" until it is resolved.

[Ludvik Koutny]

Reproduced and logged on mantis.
Archiving thread into resolved section.