If an empty line is touching another, remove it, otherwise leave it
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Regarding is this a duplicate : There are similarly worded questions such as https://unix.stackexchange.com/questions/76061/can-sed-remove-double-newline-characters or https://stackoverflow.com/questions/27510462/how-can-i-remove-double-line-breaks-with-sed - on the popular first, although the original question arguably is the same as mine, its accepted and most upvoted question removes all empty lines, not just "when there are 2 or more together" like the question asked. Some comments complain that that answer and others behave that way, but no answers are given to leave a single empty line be. Some other answers turn duplicate empty lines into a single empty line (squeezing), rather than removing them entirely. I'm looking for a scriptable way to remove back to back empty lines, but leave sin...