Optional support for default value for NULL string values

[nick42]

I don't know if this is of-interest, but...

I've written a local customization to allow a default value of "(null)" to be used when NULL string values are specified (in keeping with the default handling of such for CString on Windows). I did it was an optional #define to activate, such that it would have no performance/other impact in the "normal" usage case. The code probably isn't as clean as it could be, but I thought I'd post it, in case there is any interest in incorporating something similar into the main project, and/or anyone else finds it useful.

I'll attach the diff, generated from the local git repo, for reference.

diff.txt

[vitaut]

Thanks for the diff. I'm not sure if it is worth including in the core library, but maybe someone will find it useful.