Issue 4808 Make chord-naming robust against unsetting majorSevenSymbol

This will likely be changed anyway as soon as rewriting
chord-names is seriously tackled.
At least it might be a reminder to take care of the possibility
a user wants to unset majorSevenSymbol.
Regtest amended.

1 files changed, 6 insertions, 1 deletions

diff --git a/input/regression/chord-name-major7.ly b/input/regression/chord-name-major7.ly
index 285c41ce29..7a2109cd22 100644
--- a/input/regression/chord-name-major7.ly
+++ b/input/regression/chord-name-major7.ly
@@ -1,11 +1,16 @@
 \version "2.16.0"
 \header {
     texidoc = "The layout of the major 7 can be tuned with
-@code{majorSevenSymbol}."
+@code{majorSevenSymbol}.  It does not break if @code{majorSevenSymbol} is unset.
+One should see: triangle - j7 - triangle - #7."
 }
 
 \chords {
     c:7+
     \set majorSevenSymbol = \markup { "j7" }
     c:7+
+    \unset majorSevenSymbol
+    c:7+
+    \unset Score.majorSevenSymbol
+    c:7+
 }