fix(http): npe in `http.Reset` command

[rustatian]

Reason for This PR

ref: #155

Description of Changes

• check pool in the http.Reset method.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.] [Reviewer TODO: Verify that these criteria are met. Request changes if not]

• [x] All commits in this PR are signed (git commit -s).
• [x] The reason for this PR is clearly provided (issue no. or explanation).
• [x] The description of changes is clear and encompassing.
• [x] Any required documentation changes (code and docs) are included in this PR.
• [x] Any user-facing changes are mentioned in CHANGELOG.md.
• [x] All added/changed functionality is tested.

[codecov[bot]]

Codecov Report

Merging #156 (4000d93) into master (178cac4) will decrease coverage by 0.05%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #156      +/-   ##
==========================================
- Coverage   67.28%   67.23%   -0.06%     
==========================================
  Files         135      135              
  Lines       10287    10292       +5     
==========================================
- Hits         6922     6920       -2     
- Misses       2647     2653       +6     
- Partials      718      719       +1     

Impacted Files	Coverage Δ
http/plugin.go	74.48% <0.00%> (-1.31%)	:arrow_down:
beanstalk/beanstalkjobs/item.go	77.14% <0.00%> (-2.86%)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 178cac4...4000d93. Read the comment docs.