CPP11 — string sequences and empty strings

Summary: For string sequences, new string elements, that are created when the
sequence length is increased, should be initialized to the empty string.

I therefore raise this herewith as an official issue.

I also don"t think it makes sense to vote on issue 2234 before we
decided on the issue above. As I already pointed out, I raised issue
2234 in the believe that the spec already says that new string sequence
elements are initialized as empty string. But this assumption was wrong.

closed and fixed