[PATCH V2] evolve: add template to show evolution troubles (issue4686)

[Pulkit Goyal]

> +  changeset:   3:980f7dc84c29
> +  evolution:
> +  parent:      0:cb9a9f314b8b
> +  user:        test
> +  date:        Thu Jan 01 00:00:00 1970 +0000
> +  summary:     d

In such cases can't we handle like, if evolution or the value returned
is none or empty, don't show the evolution part. Because this empty
line is bit weird.

> +  changeset:   2:d36c0562f908
> +  evolution:
> +  parent:      0:cb9a9f314b8b
> +  user:        test
> +  date:        Thu Jan 01 00:00:00 1970 +0000
> +  summary:     c
> +
> +  changeset:   0:cb9a9f314b8b
> +  evolution:
> +  user:        test
> +  date:        Thu Jan 01 00:00:00 1970 +0000
> +  summary:     a
> +
>    $ cd ..
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