refactor(sterni/blipqn): only attempt •CurrentError when it'll work HEAD r/9189 canon

I've finally figured out what the problem was with •CurrentError:
Passing a namespace as 𝕩 to •CurrentError is not supported as it may
control some kind of special behavior in the future. The right thing to
do seems to check the •Type of 𝕩 and only attempt to use •CurrentError
if it isn't a namespace.

Change-Id: I012009d0f1b913e77d65776ee43062817199baab
Reviewed-on: https://cl.tvl.fyi/c/depot/+/13106
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>

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