[PROJ] Point not within available datum shift grids

[Even Rouault]

> Thanks for the advice on using infinity instead of NaN / no data value.
Yeah, also there was a github issue discussion about switching to using 
NaN instead of Infinity for invalid values 
(https://github.com/OSGeo/PROJ/issues/2376), but there has been no 
change on that front for now
>
>
>> The "null" grid is now a virtual one. You could possibly contribute a similar "infinity" one. Look at NullHorizontalShiftGrid in src/grids.cpp
> That would be a better solution! It sounds like a not too difficult feature for my first actual code contribution to PROJ. What is the deadline for the next PROJ release that could contain such feature?

Would be for 8.1.0 planned for July 1st


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