[Templates] Can a template discover if a block is defined?

[Clinton Gormley]

You can do a TRY block.  But you must catch the error.

TRY;
  PROCESS FOO;
CATCH;
  '';
END;

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> Template 2 (bar.tt):
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> [% PROCESS foo IF foo.defined # in other words if the block foo exists
> %]
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> In this case TT will not compile if the BLOCK foo doesn't exist in
> foo.tt.  Is there a way in TT code to prevent that compilation error?
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> Thanks,
> 
> -Derrek 
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