vis-lua: avoid nil values in table returned by vis:mapping

Also fix compilation with ./configure --disable-help.

1 files changed, 2 insertions, 1 deletions

diff --git a/vis-lua.c b/vis-lua.c
index 6d17a1e..8aaa2ed 100644
--- a/vis-lua.c
+++ b/vis-lua.c
@@ -951,7 +951,8 @@ static bool binding_collect(const char *key, void *value, void *ctx) {
 	bool new = lua_isnil(L, -1);
 	lua_pop(L, 1);
 	if (new) {
-		lua_pushstring(L, binding->alias ? binding->alias : binding->action->help);
+		const char *help = binding->alias ? binding->alias : VIS_HELP_USE(binding->action->help);
+		lua_pushstring(L, help ? help : "");
 		lua_setfield(L, -2, key);
 	}
 	return true;