fix: handle url default db name

[achrinza]

closes #610

Signed-off-by: Rifa Achrinza [email protected]

Checklist

• DCO (Developer Certificate of Origin) signed in all commits
• npm test passes on your machine
• New tests added or existing tests modified to cover all changes
• Code conforms with the style guide
• Commit messages are following our guidelines

[coveralls]

Pull Request Test Coverage Report for Build 1226722342

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 2 of 4 (50.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 81.518%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/mongodb.js	2	4	50.0%

Totals
Change from base Build 1223945738:	-0.1%
Covered Lines:	903
Relevant Lines:	1045

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💛 - Coveralls