enhancement: Update string renderer to add empty lines only when commits are present.

[shrikanthkr]

Fixes: #118

Fix markdown-renderer to add empty lines only when release commits are present. If there are no commits it returns an empty string.

[Turbo87]

can you add a test case for this or adjust an existing test case if one exists already?

[shrikanthkr]

@Turbo87 Yeah sure. Am working on that.

[shrikanthkr]

@Turbo87 Fixed the code as per the snapshot file which was used for testing.

[shrikanthkr]

@Turbo87 Any suggestions on this?

[Turbo87]

there might have been a misunderstanding. the tests were passing fine before your change and after your change so in the context of the tests nothing changed which makes it unclear what this PR actually does.

what I meant with my last comment, was to write a new test that would fail before your change and pass after your change. otherwise it would be very easy to regress on this new behavior.

[shrikanthkr]

Uh! Got it. Lemme do that and add more details

[shrikanthkr]

@Turbo87 Added regression snap shot and spec. Can you please take a look.

[Turbo87]

@shrikanthkr I've rebased your branch and simplified the implementation a little bit. The new tests seem to be passing fine with this implementation too and it seems a bit more readable to me. Let me know if that suits your needs too.

[shrikanthkr]

@Turbo87 Thanks for reviewing it. Looks good. 👍