Update CircularQueue.js for zero-length case

TheAlgorithms / JavaScript

Algorithms and Data Structures implemented in JavaScript for beginners, following best practices.

GNU General Public License v3.0

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Describe your change:

[ ] Add an algorithm?
[X] Fix a bug or typo in an existing algorithm?
[ ] Documentation change?

Checklist:

[X] I have read CONTRIBUTING.md.
[X] This pull request is all my own work -- I have not plagiarized.
[X] I know that pull requests will not be merged if they fail the automated tests.
[X] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
[X] All new JavaScript files are placed inside an existing directory.
[X] All filenames should use the UpperCamelCase (PascalCase) style. There should be no spaces in filenames. Example:UserProfile.js is allowed but userprofile.js,Userprofile.js,user-Profile.js,userProfile.js are not
[X] All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
[X] If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 84.07%. Comparing base (702840b) to head (d8323c8).

Files	Patch %	Lines
Data-Structures/Queue/CircularQueue.js	0.00%	1 Missing :warning:

Files

Patch %

Lines

Data-Structures/Queue/CircularQueue.js

0.00%

1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1655 +/- ## ======================================= Coverage 84.07% 84.07% ======================================= Files 375 375 Lines 19688 19688 Branches 2914 2914 ======================================= Hits 16552 16552 Misses 3136 3136 ```

TheAlgorithms / JavaScript