Log commit author and skip assign issues not created

[sidsprasad]

• Logging the commit author while retrieving from API
• In some cases (Like ADD_LIMIT being set), some issues might not have been created. In those cases, skip assigning the issue.

[sidsprasad]

@ribtoks
While running in my repo, I came across two issues.

1. If the issue wasn't created in the first place, it still tries assigning the author, so added a condition to skip that over here.
2. All the issues were being assigned to me for some reason. So, logging the commit hash here, and will verify with the API why it is getting me as the author. Also good to log this info anyway.

[sidsprasad]

@ribtoks I ran this again on my repo and the issue is that the Commit API was never actually called.

So there's two possible reasons for this:

1. tdg doesn't return commithash properly and so Line 381 is never true.
2. commitToAuthorCache is misbehaving, and Line 357 is always returning hits. This is more likely the cause as the size of issueTitleToAssigneeMap is correct.

Will create another PR to add another line of logging to confirm this.