[3.15] gh-155194: Fix not raising on non-module import - #155188
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As initially reported here: https://discuss.python.org/t/sys-lazy-modules-clarification/108385
lazy import math.pihas divergent behavior fromimport math.pi. Currently we allow this to work and just give you themathmodule. Instead we should raiseModuleNotFoundErrorbecausemath.piis not a module.lazy import math.pi#155194