My guess is all the module results are contained in a key called 'results' 
within the var that you registered. 

Try this

- debug:
        var: "{{ docker_repo_line }}"

I suspect that the bit you want is in
- debug:
        msg: "{{ docker_repo_line.results.stdout }}"

But try inspecting the whole of the var. If there is a lot of output, use 
something like Jsonlint.com to pretty print the json so that you can get a 
clearer idea of what is being returned.

Hope this helps,

Jon 

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