Open questions with a blank space causes "there is no line to end here" LaTeX error (Bug #356)

When you use the \AMCOpen question there can't be a blank line above it, or it will throw a "there is no line to end here" error.

However, this behaviour is not standard, and one should expect to be allowed to have blank lines in between the \AMCOpen and the question.

\documentclass{article}

\usepackage[]{automultiplechoice}    
\begin{document}

\onecopy{1}{

\begin{question}{prez}    
  Among the following persons, which one has ever been a President of the French Republic?

  \AMCOpen{lines=5}{\wrongchoice[W]{w}\scoring{0}\wrongchoice[P]{p}\scoring{2}\correctchoice[C]{c}\scoring{4}}
\end{question}
}   
\end{document}

Test the above, and see that if you remove the blank line (or commented it) between the question and the \AMCOpen you get no error.

My intuition says that in the implementation of the environments there is probably a \\ or something similar that expects text, but as there is nothing there we get an error.