[9.1] [Controls] Fix error when selecting "(blank)" value in options list (#239791)#239813
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kibanamachine merged 1 commit intoelastic:9.1from Oct 20, 2025
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…lastic#239791) Fixes elastic#239735 ## Summary Fixes an error in the Options list control when selecting a "(blank)" value. Makes the boolean check for key more explicit using [loose equality to check if the key is null or undefined](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Equality_comparisons_and_sameness#loose_equality_using). Without this, selecting a `""` value causes the control to error. (cherry picked from commit 3675825)
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