fix #20; update readme according to nexttrace development status

Author: Archeb

Program.cs

@@ -15,11 +15,11 @@ static void Main(string[] args)
         {
             UserSettings.LoadSettings();
 
-            if (UserSettings.language != "")
+            if (UserSettings.language != "" && UserSettings.language != null)
             {
                 System.Threading.Thread.CurrentThread.CurrentUICulture = new CultureInfo(UserSettings.language);
             }
-            if(UserSettings.mapProvider == "")
+            if(UserSettings.mapProvider == "" && UserSettings.mapProvider != null)
             {
                 // 本地化地图供应商设置
                 if (System.Threading.Thread.CurrentThread.CurrentUICulture.Name == "zh-CN")

readme.md

@@ -8,7 +8,7 @@
 
 OpenTrace is a cross-platform GUI wrapper for NextTrace. Bringing you a sense of familiarity.
 
-You need a working NextTrace (>= 1.1.7) executable to use this.
+You need a working **NextTrace V1** (>= 1.1.7) executable to use this.
 
 ### Features
 
@@ -28,7 +28,7 @@ More is coming...
 
 - Download OpenTrace from [releases](https://github.com/Archeb/opentrace/releases) or build your own binary.
 
-- Follow the instruction to install [NextTrace](https://github.com/nxtrace/Ntrace-V1/releases): Download the latest release from [here](https://github.com/nxtrace/Ntrace-V1/releases), and place it in either the same directory as the OpenTrace executable or a directory included in your system's PATH environment variable.
+- Follow the instruction to install [NextTrace V1](https://github.com/nxtrace/Ntrace-V1/releases): Download the latest release from [here](https://github.com/nxtrace/Ntrace-V1/releases), and place it in either the same directory as the OpenTrace executable or a directory included in your system's PATH environment variable.
 
 - Run OpenTrace(.exe)