Preserve original body contents in action section

To resolve danielgtaylor/aglio#357, Generate action
body from the Attributes only when missing specified body.  line feed is need
to get rid of following message...

    ✗ #433: Line exceeds maximum allowed length. Length is 84, max is 80.

src/main.coffee

@@ -430,7 +430,8 @@ decorate = (api, md, slugCache, verbose) ->
                           JSON.stringify dataStructure.content[0], null, 2)
                         console.log(err)
 
-              if item.content and not process.env.DRAFTER_EXAMPLES
+              if not item.body and
+                  item.content and not process.env.DRAFTER_EXAMPLES
                 for dataStructure in item.content
                   if dataStructure.element is 'dataStructure'
                     try