test suite: Use dch -r -D sid '' not dch -r sid.

Bizarrely,
   dch -r [-D suite]
runs $EDITOR but
   dch -r [-D suite] weevils
ignores `weevils' but does not run $EDITOR.  This is #903598.

Apparently, this is well known, and convention is to pass ''.
See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903598#8.

So use that.

Closes:#903441.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/lib b/tests/lib
index 04d1f2d..e06ae22 100644
--- a/tests/lib
+++ b/tests/lib
@@ -1009,7 +1009,7 @@ t-commit () {
 t-dch-r-rune () {
 	local cmd="$1"; shift
 	local suite=${1-unstable}
-	$cmd -r sid
+	$cmd -r -D "$suite" ''
 }
 
 t-dch-commit-r () {