[PATCH] Exit.java - Added if and unless attributes

[Nico Seessle]

'if' and 'unless' are now supported by the fail-task. This allows for
example to check for required properties without the need to specify a
separate target for every property which you want to check for. The
behaviour is slightly different from target, since empty properties (equal
to "") are handled as if they don't exist.

Nico

exit.patch
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