Don't let jasmine swallow errors by ignoring its expectationResultHandler

[christian-bromann]

Proposed changes

Currently Jasmine is swallowing errors if an expectationResultHandler is set without doing anything. This patch fixes this. It will ensure that the original handler is always called but the user still has the ability to change the assertion outcome.

Types of changes

• Bugfix (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 not work as expected)

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

Reviewers: @webdriverio/technical-committee

[codecov]

Codecov Report

Merging #3240 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3240      +/-   ##
==========================================
+ Coverage   96.44%   96.48%   +0.04%     
==========================================
  Files         131      131              
  Lines        2810     2848      +38     
  Branches      607      618      +11     
==========================================
+ Hits         2710     2748      +38     
  Misses         90       90              
  Partials       10       10

Impacted Files	Coverage Δ
packages/wdio-jasmine-framework/src/index.js	100% <100%> (ø)	⬆️
packages/wdio-runner/src/reporter.js	100% <0%> (ø)	⬆️
...kages/webdriverio/src/commands/element/addValue.js	100% <0%> (ø)	⬆️
...es/webdriverio/src/commands/element/getProperty.js	100% <0%> (ø)	⬆️
...kages/webdriverio/src/commands/element/setValue.js	100% <0%> (ø)	⬆️
...kages/webdriverio/src/commands/element/getValue.js	100% <0%> (ø)	⬆️
...erio/src/commands/element/isDisplayedInViewport.js	100% <0%> (ø)	⬆️
...ges/webdriverio/src/commands/element/isExisting.js	100% <0%> (ø)	⬆️
...es/webdriverio/src/commands/element/doubleClick.js	100% <0%> (ø)	⬆️

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