fix for WhenAnyValue now returns non nullable type

[ChrisPulman]

fix #2806
Remove nullable return value from WhenAnyValue

What kind of change does this PR introduce?

fix

What is the current behaviour?

WhenAnyValue has a return type of T?

What is the new behaviour?

WhenAnyValue has a return type of T

What might this PR break?

None

Please check if the PR fulfils these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

[codecov]

Codecov Report

Merging #2808 (39b5af6) into main (b2e9db9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2808   +/-   ##
=======================================
  Coverage   64.47%   64.47%           
=======================================
  Files         134      134           
  Lines        4712     4712           
=======================================
  Hits         3038     3038           
  Misses       1674     1674           

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[github-actions]

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