Additional edge test in max-of-vector needed

[mariuszlisowski]

Test against the edge case when the vector is empty. Could be useful when std::max_element() is used form algorithm header and dereferencing its result could cause segmentation fault.

If iterative solution is used, when nothing is found then std::numeric_limits::min() may be returned if defined.
Similarly if max is initialized with the first element of a vector - SegFault.

[ziobron]

🏅 2 XP granted for @mariuszlisowski
Thanks for raising this Issue to help to make the course better!

[ziobron]

@mariuszlisowski Would you try to add this new edge case?