Tab: handle non-core kegs without receipts
Tab: handle non-core kegs without receipts

Passing Formula.factory the name of a keg that belongs to a non-core
formula will cause an error to be raised; we don't really care, so just
fake a totally empty install receipt in this case.

Signed-off-by: Jack Nagel <43386ce32af96f5c56f2a88e458cb94cebee3751@gmail.com>

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