Tangential to bug 25733 If ClaimsReturnedWarningThreshold is empty, it should be ignored and no message should be shown in patron account. Imagine: - a library decides to use Claims Returned, sets it up, uses it for a while - the library decides not to use it anymore and removes the values from ClaimReturnedLostValue and ClaimReturnedWarningThreshold - Koha treats the blank in ClaimReturnedWarningThreshold as a zero, shows the warning for anyone who still has 1 or more claims in the database - With ClaimReturnedLostValue unset, there is no longer a way to see or address those claims