fix(cdk/listbox): incorrectly validating preselected value #25893
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In angular#25856 the check that verifies the validity of the form control value was moved into `writeValue`. This works as expected for assignments after initialization, but it throws an error incorrectly if there is a preselected value, because `writeValue` will be called before the options are available. These changes resolve the issue by checking that the options have been initialized before throwing the error.
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In #25856 the check that verifies the validity of the form control value was moved into `writeValue`. This works as expected for assignments after initialization, but it throws an error incorrectly if there is a preselected value, because `writeValue` will be called before the options are available. These changes resolve the issue by checking that the options have been initialized before throwing the error. (cherry picked from commit 166ed5e)
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In #25856 the check that verifies the validity of the form control value was moved into
writeValue. This works as expected for assignments after initialization, but it throws an error incorrectly if there is a preselected value, becausewriteValuewill be called before the options are available.These changes resolve the issue by checking that the options have been initialized before throwing the error.