Mandar Kulkarni b0ff91ff09 Spreadsheet: Make convert_from_string() return Optional<size_t> ...

Earlier, we were using 0 value for characters not found in "map".

We should return failure for invalid inputs.
So, I have changed the return type of function to Optional<size_t>.

Also changed caller to handle Optional return.

2021-08-09 14:14:07 +04:30

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