How to remove additional vertical line from dock created by Automator app

I couldn't figure out how to get Automator to do it, but I was able to beat AppleScript into submission. Just save the following as an Application in the AppleScript Editor, then drag the files you want to convert onto the icon. It will prompt you to choose a folder where the converted files will be placed.

on open droppedFiles
    set theDestinationFolder to (choose folder with prompt "Choose destination folder") as Unicode text
    repeat with theFile in droppedFiles
        tell application "Keynote"
            open theFile
            set theSlideshow to slideshow 1
            set theDestinationPath to theDestinationFolder & (name of theSlideshow)
            save theSlideshow in theDestinationPath
            close theSlideshow
        end tell
    end repeat
end open

(I don't really know what I'm doing with AppleScript. If there are improvements that can be made here, I'd like to know about them.)

When working with Automator workflows, it’s always good to check hat an action takes as its input and what it returns as output. Usually, this is indicated in the action’s description (accessible either in the bottom left below the action browser, or by clicking on “description” in the action’s bottom row. The actual output when running the action can also be checked (by clicking “result” in the bottom row of the action).

In your case, checking will show the “Combine PDF Pages” returns a PDF Document file. This file can be processed by any Automator action that can handle files in general (for file operations) or PDF files (for further editing). A look in the “Finder” category of Automator will show you likely candidates:

1. Move Finder Items will move the file to a target folder of your choice. You can set a fixed one, or tick “Show this action when running the workflow” in “options” (bottom row again) to select each time you run the workflow. This action, again, returns a PDF Document, which
2. Rename Finder Items will rename a file. As the action returns a PDF Document, you can daisy chain rename actions with different settings, for instance to give it a selectable base name (choose “rename single item” and tick the show option), add a date stamp (add another actions et to append the date) and a time stamp (same procedure, now with the time).