sed/vi how to concatenate all non-empty lines?

["Jean-Christian Imbeault" <jean_christian@example.com>]

I've been wracking my little brain over this for too long ^_^

I have a text file with some formatting I want to get rid of. Looks like a 
CR is present at the end of each line to format the text to 76 char per 
line. I want to get rid of this to have all text for one paragraph on one 
big line.

So how to I get sed or vi to concatenate all lines within a paragraph into 
one linebut keep the empty lines between paragraphes? (i.e. concatenate all 
consecutive non-empty lines together)?

Thanks!

Jc

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