Clarify Javadoc to make clear that certain operations fail if there is

[kwin]

no current execution

Related Issue

#21

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:

• I have signed the Adobe Open Source CLA.
• 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]

Codecov Report

Merging #22 (e3e2488) into main (98e4de5) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main      #22   +/-   ##
=========================================
  Coverage     88.92%   88.92%           
  Complexity      166      166           
=========================================
  Files            14       14           
  Lines           551      551           
  Branches         48       48           
=========================================
  Hits            490      490           
  Misses           43       43           
  Partials         18       18           

Flag	Coverage Δ	Complexity Δ
unittests	88.92% <ø> (ø)	0.00 <ø> (ø)

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