deps/obs-scripting: Allow NULL script with script_log

(This commit also modifies the frontend-tools module)

Prevents a potential crash when script_log is called by a thread spawned
by a python library.

UI/frontend-plugins/frontend-tools/scripts.cpp

@@ -494,9 +494,14 @@ static void script_log(void *, obs_script_t *script, int log_level,
 		const char *message)
 {
 	QString qmsg;
-	qmsg = QStringLiteral("[%1] %2").arg(
-			obs_script_get_file(script),
-			message);
+
+	if (script) {
+		qmsg = QStringLiteral("[%1] %2").arg(
+				obs_script_get_file(script),
+				message);
+	} else {
+		qmsg = QStringLiteral("[Unknown Script] %1").arg(message);
+	}
 
 	QMetaObject::invokeMethod(scriptLogWindow, "AddLogMsg",
 			Q_ARG(int, log_level),

deps/obs-scripting/obs-scripting-logging.c

@@ -28,14 +28,19 @@ void script_log_va(obs_script_t *script, int level, const char *format,
 	const char *lang = "(Unknown)";
 	size_t start_len;
 
-	switch (script->type) {
-	case OBS_SCRIPT_LANG_UNKNOWN: lang = "(Unknown language)"; break;
-	case OBS_SCRIPT_LANG_LUA:     lang = "Lua"; break;
-	case OBS_SCRIPT_LANG_PYTHON:  lang = "Python"; break;
+	if (script) {
+		switch (script->type) {
+		case OBS_SCRIPT_LANG_UNKNOWN: lang = "(Unknown language)"; break;
+		case OBS_SCRIPT_LANG_LUA:     lang = "Lua"; break;
+		case OBS_SCRIPT_LANG_PYTHON:  lang = "Python"; break;
+		}
+
+		start_len = snprintf(msg, sizeof(msg), "[%s: %s] ",
+				lang, script->file.array);
+	} else {
+		start_len = snprintf(msg, sizeof(msg), "[Unknown Script] ");
 	}
 
-	start_len = snprintf(msg, sizeof(msg), "[%s: %s] ",
-			lang, script->file.array);
 	vsnprintf(msg + start_len, sizeof(msg) - start_len, format, args);
 
 	if (callback)

deps/obs-scripting/obs-scripting-python.c

@@ -1193,7 +1193,11 @@ static PyObject *py_script_log_internal(PyObject *self, PyObject *args,
 
 	while (endl) {
 		*endl = 0;
-		script_log(&cur_python_script->base, log_level, "%s", start);
+		if (cur_python_script)
+			script_log(&cur_python_script->base, log_level, "%s",
+					start);
+		else
+			script_log(NULL, log_level, "%s", start);
 		*endl = '\n';
 
 		start = endl + 1;