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Show a warning if a Texture Filter node does not like the input format

Hey there,

Was applying some texture filters (say Transform) on a Texture coming from a DDS stack (BC7_Unorm).

The Transform node was outputting a null even though there was something coming in. After trying various things (thought it was a runtime issue), I used a ChangeFormat before Transform's input, which solved the issue.

Could there be a meaningful warning when such a thing happens, rather than just outputting a scary null?

Thanks!

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