[3.6] bpo-31293: Fix crashes in truediv and mul of a timedelta by a float with a bad as_integer_ratio() method. (GH-3227)

[miss-islington]

(cherry picked from commit 865e4b4)

https://bugs.python.org/issue31293

[the-knights-who-say-ni]

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[miss-islington]

@orenmn and @serhiy-storchaka: Backport status check is done, and it's a success ✅ .

[miss-islington]

@orenmn and @serhiy-storchaka: Backport status check is done, and it's a success ✅ .

[miss-islington]

Thanks, @serhiy-storchaka!