Issue #125 fixed

android/Pictogram/commonlibrary/src/main/java/com/yottacode/pictogram/dao/User.java

@@ -37,7 +37,6 @@ public class User  {
         static String TTS_ENGINE = "tts engine";
         static String TTS_VOICE = "tts voice";
         static String DELIVERY = "delivery";
-        static String SUPERVISORS = "supervisors";
     }
     public final static class JSON_STUDENT_INPUT_FEEDBACK {
         public static String VIBRATION="vibration";
@@ -45,6 +44,7 @@ public class User  {
         public static String READ="read";
         public static String HIGHLIGHT="highlight";
     }
+    private String supervisors;
     private Img img_stu;
     private String nickname_stu, pwd_stu, name_stu, surname_stu, gender_stu, lang_stu;
     private JSONObject attributes_stu;
@@ -268,22 +268,11 @@ public class User  {
     }
 
     public String get_Supervisors(){
-        String supervisors = null;
-        try{
-            supervisors = this.attributes_stu.getString(JSON_STUDENT_ATTTRS.SUPERVISORS);
-        } catch (JSONException e) {
-            e.printStackTrace();
-        }
-        return supervisors;
+        return this.supervisors;
     }
 
-    public void set_Supervisors(String newSup){
-        try {
-            this.attributes_stu.remove(JSON_STUDENT_ATTTRS.SUPERVISORS);
-            this.attributes_stu.put(JSON_STUDENT_ATTTRS.SUPERVISORS,newSup);
-        } catch (JSONException e) {
-            e.printStackTrace();
-        }
+    public void set_Supervisors(String newSup) {
+        this.supervisors = newSup;
     }
     /**
      *