Fix "match bug with echo"

[jdemeyer]

#15631 added the following lines to src/sage/interfaces/expect.py:

                    if out == '':   # match bug with echo
                        out = line

It seems these were added to be compatible with an existing bug.

Instead, fix that bug!

CC: @vbraun

Component: interfaces

Author: Jeroen Demeyer

Branch/Commit: 4014b69

Reviewer: Frédéric Chapoton

Issue created by migration from https://trac.sagemath.org/ticket/17719

[jdemeyer]

Branch: u/jdemeyer/ticket/17719

[jdemeyer]

Commit: 278e3a1

[jdemeyer]

New commits:

278e3a1

Fix match bug with echo

[jdemeyer]

Author: Jeroen Demeyer

[fchapoton]

Changed branch from u/jdemeyer/ticket/17719 to public/ticket/17719

[fchapoton]

comment:4

Looks good to me.

I have just made a small commit, adding another trac role, removing an unused variable and a duplicated import, all of that in the singular interface. If you agree, you can set this to positive review.

---

New commits:

ff34589	Merge branch 'u/jdemeyer/ticket/17719' into 6.6.b0
4014b69	trac #17719 a few details in doc of singular interface

[fchapoton]

Changed commit from 278e3a1 to 4014b69

[jdemeyer]

Reviewer: Frédéric Chapoton

[fchapoton]

comment:6

Please set to positive review, if you want

[vbraun]

Changed branch from public/ticket/17719 to 4014b69