[Cin] fileexr reading error handling

[Phyllis Smith]

Andrew, I do not think that the c++ code "try" is going to work -- it is
never used anywhere else and probably for a good reason.  Is there an
alternative?

    Fileext reading error handling for bg render
>
> commit cac447973db936f7d5594c83521c34f3e5a9c187
> Author: Andrew Randrianasulu <randrianasulu at gmail.com>
> Date:   Wed Aug 30 05:27:10 2023 +0300
>
>
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