Custom Functions are not parsed

[Excone]

When processing reports with custom functions, the report writer does not write them to XML file.

[christopherpickering]

@Excone do you happen to have an example report you can share? If you have already dug into it, feel free to send a PR or the field names if you have them handy.

[DamienAuvray]

It seems that unknown functions (missing dll in my case) are creating error while dumping the file.
Runtime error :

First line means that u2121text.dll that implementing this function is missing. I also have this error on crystal report, this dll seems to be installed only on our print servers (and not on my dev env).