A Perl one-liner to remove the blank lines from your file (changing the original file, please test it first with dummy files): 
perl -ni.bak -e "print $_ if /\w/;" my_file.txt

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In reply to Re: Way to remove the new line characters at the end of the content in a file by Laurent_R
in thread Way to remove the new line characters at the end of the content in a file by shroh

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