Section "Final code in exception handling" has errors

[Adil-Ibragimov]

Example of code in the section has errors. The real output will be different from what is said in listing.
It will be

-- division finished --
2.0
-- division finished --
12.0
Error: Invalid argument: division by zero
-- division finished --
None

instead of

21.0
-- division finished --
3.5
-- division finished --
Error: Invalid argument: division by zero
-- division finished --
None
-- division finished --

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[wilfredinni]

Fixed