check for a blank caption line #4
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Sometimes the caption line is blank. This fix checks to see if the caption is there at all and if not it doesn't bail.
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Sometimes the caption line is blank and this was erroring. It looks like you're expecting an identifier each time. This simplifies it a bit by shifting the array that is passed in for the leading lines. I'm also joining with a space instead so you get a single line rather than one with newlines.