Adds conditional for no pull request for existing branch

[sachin-sandhu]

What are you trying to accomplish?

Fixes issue related with throwing exception on finding a same name branch.

Also fixes , filtering issue where also includes closed PR when looking for only open PRs

Anything you want to highlight for special attention from reviewers?

How will you know you've accomplished your goal?

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.