fix(video): Fix blank values on Dial API

[dragonmantank]

Description

The Dial API does not properly handle blank strings ('') versus null values in parameters passed in, so this adds a method and strips the blank strings if they are passed in. This also includes a long overdue whitespace fix

Relevant functions are:

intiateSIPCall()
stripBlankValues()

Motivation and Context

Bug reported in UAT testing the new SDK versus the old OpenTok SDK

Testing Details

Unit tests

Example Output or Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #828 (4380d4c) into 3.x (a9a36c9) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              3.x     #828      +/-   ##
==========================================
+ Coverage   79.68%   79.81%   +0.12%     
==========================================
  Files          99       99              
  Lines        1265     1273       +8     
  Branches      252      254       +2     
==========================================
+ Hits         1008     1016       +8     
  Misses        256      256              
  Partials        1        1              

Impacted Files	Coverage Δ
packages/video/lib/video.ts	83.68% <100.00%> (+0.98%)	⬆️

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