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Related issue: #5782
This is an attempt to solve the error when slideLabelMessage is set to null in a11y settings. Seems to work with a quick test.
Food for thought: slideLabelMessage should be null by default, instead of
slideLabelMessage: '{{index}} / {{slidesLength}}',
. It's not practical to add text-overriding slide numbering for screen-readers. I decided to not include that null-default in my PR though at this time.