Issue switching to line term mode, then using hippie-expand

[dangirsh]

• GNU Emacs 26.1.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.18.9) of 2018-07-23
• Julia v1.0.2
• julia-repl 20180910.841

Reproduction steps:

Start a new REPL, which starts in char term mode. Then, write a partial line like wri. Now, switch to line term mode with C-x C-j. Now run hippie-expand to complete the line (completes to write for me).

Even though the terminal shows write, if I now hit RET, the partial command wri is sent and I get:

julia> wri
ERROR: UndefVarError: wri not defined

hippie-expand on lines that started off in line term mode works fine.

Minor issue, but thought I'd document it here.