Fix gist

src/main/java/de/jeyp91/gists/GistProvider.java

@@ -31,25 +31,25 @@ public class GistProvider {
     private String password;
 
     private GistProvider() {
-        this.gistList = listAllGists();
         readConfig();
+        this.gistList = listAllGists();
     }
 
     private void readConfig() {
         JSONParser jsonParser = new JSONParser();
         URL url = Resources.getResource("Gist_Config.json");
-        JSONObject gistConfig;
+        JSONObject gistConfig = null;
 
         try {
             String jsonConfig = Resources.toString(url, StandardCharsets.UTF_8);
             //Read JSON file
             gistConfig = (JSONObject) jsonParser.parse(jsonConfig);
-            this.username = gistConfig.get("username").toString();
-            this.password = gistConfig.get("password").toString();
 
         } catch (IOException | ParseException e) {
             e.printStackTrace();
         }
+        this.username = gistConfig.get("username").toString();
+        this.password = gistConfig.get("password").toString();
     }
 
     public static GistProvider getInstance() {