pylint #107102 F0401 false positive: import error considered fatal even in "try/except ImportError" [open]

The following code is valid, but triggers:

F: 2,4: Unable to import 'blurb'

---- 8< ----
try:
import blurb
a = blurb.a
except ImportError:
a = False

prioritynormal
typebug
done in<not specified>
closed by<not specified>