[ADDED] First README & [FIX] path checking

README.md

@@ -0,0 +1,20 @@
+config.yml example:
+
+```
+mkvtoolnixPath: /usr/bin
+config:
+  1:
+    audio:
+      - jpn
+    subtitle:
+      - ger
+      - eng
+  2:
+    audio:
+      - ger
+      - eng
+    subtitle:
+      - OFF
+```
+Config file needs to be placed in the same directory as the jar.
+

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/AttributeUpdaterKernel.java

@@ -18,7 +18,7 @@ public class AttributeUpdaterKernel {
     public void execute(String path) {
         List<AttributeConfig> configPattern = ConfigUtil.loadConfig();
         List<File> allValidPaths = collector.loadFiles(path);
-        if(! allValidPaths.isEmpty()){
+        if(! allValidPaths.isEmpty() && configPattern != null){
             for(File file : allValidPaths){
                 List<FileAttribute> attributes = collector.loadAttributes(file);
                 for(AttributeConfig config : configPattern){
@@ -32,7 +32,7 @@ public class AttributeUpdaterKernel {
                 }
             }
         }else{
-            log.error("Path is not valid!");
+            log.error("Path is not valid or config has errors!");
         }
     }
 }

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/Main.java

@@ -22,6 +22,9 @@ public class Main {
     private static boolean checkIfMKVToolNixIsValid() {
         try{
             String path = new YAML(new File("config.yml")).getString("mkvtoolnixPath");
+            if(! path.endsWith(File.separator)){
+                path += File.separator;
+            }
             MKVToolProperties.getInstance().setMkvmergePath(path + "mkvmerge");
             MKVToolProperties.getInstance().setMkvpropeditPath(path + "mkvproperties");
         }catch(YamlKeyNotFoundException | IOException | YamlInvalidContentException e){