Validation picking up valid Observations as invalid

[KevinMayfield]

See also equivalent issue with C# validation FirelyTeam/firely-net-sdk#435

Obs-7 states "If code is the same as a component code then the value element associated with the code SHALL NOT be present"

Example entry has no component and so not the same as the code. e.g.
https://gist.github.com/KevinMayfield/7f537f96efbe702c9fd2825e18f4cd53