fix(PT Metadata): Allow for PatientWeight to be missing from the metadata

[jbocce]

Context

PR to address OHIF #3411

Changes & Results

Allow for PatientWeight to be missing from the metadata
for a PT series - instead of throwing an exception, simply log a warning. Fixes OHIF issue 3411.

Testing

Follow the steps in OHIF #3411

Checklist

PR

• My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• My code has been well-documented (function documentation, inline comments,
  etc.)

Public Documentation Updates

• The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

• OS: Windows 11
• Node version: 16.14.0
• Browser: Chrome 116.0.5845.111

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[codecov]

Codecov Report

Merging #3621 (97cce8e) into master (a336992) will not change coverage.
Report is 2 commits behind head on master.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3621   +/-   ##
=======================================
  Coverage   42.58%   42.58%           
=======================================
  Files          80       80           
  Lines        1463     1463           
  Branches      340      340           
=======================================
  Hits          623      623           
  Misses        675      675           
  Partials      165      165           

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