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Error handling of Databin

Databin does not evaluate when the bin does not exist. Calling it with an invalid id err = Databin["13X7XXXJH"] does ...
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Holding after evaluation

Here's another interpretation of the OP's objective, based on some parts of the code that don't make sense (to me, as yet) unless frac is supposed to generate a new ...
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Holding after evaluation

Try "Label" -> With[{tmp = frac}, HoldForm[DisplayForm[tmp] + DisplayForm[tmp]]] instead to evaluate before you hold.
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Holding after evaluation

As soon as you call fraction it will evaluate. Therefore, e.g. let fraction return the nominator and denominator separately. And it is easier to use "StringForm". E.g.: ...
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