Update SingleToolchainValue to properly handle missing toolchains. #15338
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This can no longer throw an exception, but needs to signal in the returned value. Part of Optional Toolchains (bazelbuild#14726).
gregestren
approved these changes
Apr 25, 2022
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This can no longer throw an exception, but needs to signal in the
returned value.
Part of Optional Toolchains (#14726).