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Check for altInputFormats to be defined and an array before using it #6511
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If the user wrongly sets a property which is undefined for the attribute alt-input-formats, this will cause an exception to be thrown when evaluating the viewValue in the method parseDateString: "Cannot read property 'length' of undefined". Checking for its existence and if it's an array or not prevents the exception.
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If the user wrongly sets a property which is undefined for the attribute
alt-input-formats, this will cause an exception to be thrown when evaluating theviewValuein the methodparseDateString."Cannot read property 'length' of undefined".Checking for its existence and if it's an array or not prevents the exception.