[DF] Fix ROOT-9632: do not throw if define return type is unknown to the interpreter
[DF] Fix ROOT-9632: do not throw if define return type is unknown to the interpreter

but add a comment to the jitted code in order to obtain a clear error message if
the user tries to use this type in a jitted action/transformation later in the chain.

karies/root,root-mirror/root,olifre/root,karies/root,olifre/root,karies/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,olifre/root,root-mirror/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,karies/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,olifre/root,karies/root,karies/root,karies/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root