[Templates] IF block is defined?

[Stuart Johnston]

I need to process a block but only if it has been defined, to avoid the 
'not found' error.

So, I might define a block like:

[% BLOCK head %]
        Some block Text.
[% END %]
Then later I want to say something like:

[% PROCESS head IF head %]

But this IF never seems to be true, even when the block has been defined.

Can someone suggest the right syntax for this?

Thanks,
Stuart Johnston
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