refactor: report undefined for no expected value()

[danielpeintner]

fixes #1228

[danielpeintner]

We have a failing test

https://github.com/eclipse-thingweb/node-wot/actions/runs/7889804138/job/21530521048#step:9:198

should throw if the stream was accessed before calling value

@relu91 mhh not sure if the test does the correct thing in this case

[danielpeintner]

We have a failing test

I fixed the test by adding a DataSchema which is now required, see 051febc

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (82f7f7a) 77.77% compared to head (be93623) 77.80%.
Report is 14 commits behind head on master.

Files	Patch %	Lines
packages/core/src/interaction-output.ts	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1230      +/-   ##
==========================================
+ Coverage   77.77%   77.80%   +0.03%     
==========================================
  Files          84       84              
  Lines       17476    17492      +16     
  Branches     1770     1773       +3     
==========================================
+ Hits        13592    13610      +18     
+ Misses       3848     3846       -2     
  Partials       36       36              

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[relu91]

Thanks @danielpeintner and sorry for being a little bit stubborn on this issue :)