SDL: ibus: make sure we don't pass a NULL path string over D-Bus.

SDL Commits
1 
From 49141996659c1a802d8d93992cacd3fb2ea5977e Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Sun, 4 Apr 2021 00:29:26 -0400
Subject: [PATCH] ibus: make sure we don't pass a NULL path string over D-Bus.

Fixes #2941.
---
 src/core/linux/SDL_ibus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/linux/SDL_ibus.c b/src/core/linux/SDL_ibus.c
index 256926d83..975955c27 100644
--- a/src/core/linux/SDL_ibus.c
+++ b/src/core/linux/SDL_ibus.c
@@ -484,7 +484,7 @@ IBus_SimpleMessage(const char *method)
 {   
     SDL_DBusContext *dbus = SDL_DBus_GetContext();
     
-    if (IBus_CheckConnection(dbus)) {
+    if ((input_ctx_path != NULL) && (IBus_CheckConnection(dbus))) {
         SDL_DBus_CallVoidMethodOnConnection(ibus_conn, IBUS_SERVICE, input_ctx_path, IBUS_INPUT_INTERFACE, method, DBUS_TYPE_INVALID);
     }
 }