travis-ci: switch to Xcode 10.1 macOS image

diff --git a/git-legacy-rebase.sh b/git-legacy-rebase.sh
index b97ffdc9dd550d8802039d672623f2ba3e7a5f0c..b4c7dbfa575d3b5c664677c22b8613284d2e33fb 100755 (executable)
--- a/git-legacy-rebase.sh
+++ b/git-legacy-rebase.sh
@@ -718,10 +718,16 @@ if test -n "$diffstat"
 then
        if test -n "$verbose"
        then
-               echo "$(eval_gettext "Changes from \$mb to \$onto:")"
+               if test -z "$mb"
+               then
+                       echo "$(eval_gettext "Changes to \$onto:")"
+               else
+                       echo "$(eval_gettext "Changes from \$mb to \$onto:")"
+               fi
        fi
+       mb_tree="${mb:-$(git hash-object -t tree /dev/null)}"
        # We want color (if set), but no pager
-       GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
+       GIT_PAGER='' git diff --stat --summary "$mb_tree" "$onto"
 fi
 
 test -n "$interactive_rebase" && run_specific_rebase