Fix a crash in Spring.GetProfilerTimeRecord (beyond-all-reason#3172)

No table was pushed, so `lua_rawset(L, -3)` tried to dereference a float as a table and segfaulted.

Author: tomjn

rts/Lua/LuaUnsyncedRead.cpp

@@ -616,23 +616,26 @@ int LuaUnsyncedRead::GetProfilerTimeRecord(lua_State* L)
 {
 	const CTimeProfiler::TimeRecord& record = CTimeProfiler::GetInstance().GetTimeRecord(lua_tostring(L, 1));
 
-	int numRet = 5;
+	const bool wantFrameData = luaL_optboolean(L, 2, false);
+
 	lua_pushnumber(L, record.total.toMilliSecsf());
 	lua_pushnumber(L, record.current.toMilliSecsf());
 	lua_pushnumber(L, record.stats.x); // max-dt
 	lua_pushnumber(L, record.stats.y); // time-%
 	lua_pushnumber(L, record.stats.z); // peak-%
 
-	if (luaL_optboolean(L, 2, false)) {
-		for (size_t i = 0; i < record.frames.size(); i++) {
-			lua_pushnumber(L, i + 1); // key
-			lua_pushnumber(L, record.frames[i].toMilliSecsf()); // val
-			lua_rawset(L, -3);
-		}
-		++numRet;
+	if (!wantFrameData)
+		return 5;
+
+	lua_createtable(L, record.frames.size(), 0);
+
+	for (size_t i = 0; i < record.frames.size(); i++) {
+		lua_pushnumber(L, i + 1); // key
+		lua_pushnumber(L, record.frames[i].toMilliSecsf()); // val
+		lua_rawset(L, -3);
 	}
 
-	return numRet;
+	return 6;
 }
 
 /***