EFA#94: Mail for unexpected exceptions do not contain exception call stack

[cubitusgh2]

If an unexpected Exception occurrs, efa sends an automatic mail to the efa admin, with the request to forward it to efa developers.

The automatic mail contains the exception Message (e.g. java.lang.nullpointerexception), and also the latest entries in efa.log, but it does not contain the exception call stack.

In cases of Nullpointer exceptions, an exception call stack is neccessary to get a clue where the reason exactly occurred.