Update JS and TS routes for null parameters

[rogebrd]

• Fix for (JS #41)
• Update route to not have arg when there is no parameter
• Update comments to also not contain arg when no parameter
• Update tests for both clients

Checklist

General Contributing

• Have you read the Code of Conduct and signed the CLA?

Is This a Code Change?

• Non-code related change (markdown/git settings etc)
• Code Change
• Example/Test Code Change

Validation

• Have you ran tox?
• Do the tests pass?

[aelawson]

Looks good, but we need to update the version (this is also a breaking change so should should be major version bump).

[codecov]

Codecov Report

Merging #186 into master will increase coverage by 0.04%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #186      +/-   ##
==========================================
+ Coverage   50.81%   50.86%   +0.04%     
==========================================
  Files          37       37              
  Lines        8322     8334      +12     
  Branches     1770     1776       +6     
==========================================
+ Hits         4229     4239      +10     
- Misses       3780     3782       +2     
  Partials      313      313              

Flag	Coverage Δ
#unit	50.86% <83.33%> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
stone/backends/js_client.py	76.11% <75.00%> (-0.16%)	⬇️
stone/backends/tsd_client.py	62.12% <100.00%> (+2.44%)	⬆️

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