embedding a non-existent file will fail;
_ = @embedFile("doesnotexist")
is there a way to try and catch this?
try/catch are runtime things. This is a compile error.
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uh right, seems I need to rethink my approach 
A better approach might be to handle finding the file at build time, where you can use more of the runtime stdlib io (and thus try/catch). Then you would add the found files as anonymous imports/modules that can still be embedded using @embedFile("anon_mod_name").
The build guide shows some of this here which I think can be adapted to your needs.
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discovered yesterday that @dude_the_builder made a related tutorial video (code gen) - very helpful 
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