Checklist show error if user identity is empty

app/src/main/java/de/tu_chemnitz/wlan/Helper.java

@@ -609,15 +609,21 @@ class Helper {
                     else if (currentConfig.allowedGroupCiphers.toString().contains("2")) message+=" with TKIP";
                     list.add(new MainActivity.TickLine(ticked, message, "SSID", false));
 
+                    ticked = false;
                     message = currentConfig.enterpriseConfig.getIdentity();
-                    if( message.contains("@") ) {
-                        message = message.substring(0, message.indexOf('@'));
-                        if( message.contains("-") ) {
-                           message = message.substring(0, message.indexOf('-'));
+                    if( message != null && !message.isEmpty() ) {
+                        if (message.contains("@")) {
+                            message = message.substring(0, message.indexOf('@'));
+                            if (message.contains("-")) {
+                                message = message.substring(0, message.indexOf('-'));
+                                ticked = true;
+                            }
                         }
+                    } else {
+                        message = context.getString(R.string.tickline_subtext_user_identity_not_found);
+                        ticked = false;
                     }
 
-                    ticked = true;
                     list.add(new MainActivity.TickLine(ticked, message, "User Identität", false));
 
                     if (currentConfig.enterpriseConfig.getAnonymousIdentity().length()>0) {

app/src/main/res/values/strings.xml

@@ -19,6 +19,7 @@
     <string name="tickline_subtext_ca_cert_certificate_ok">OK</string>
     <string name="tickline_subtext_ca_cert_certificate_not_found">Zertifikat nicht gefunden</string>
     <string name="tickline_subtext_ca_cert_certificate_wrong">Falsches Zertifikat</string>
+    <string name="tickline_subtext_user_identity_not_found">Nicht vorhanden</string>
 
     <plurals name="connect_to_internet_message">
         <item quantity="one">Bitte stelle eine Internetverbindung mit einem WLAN oder über mobile Daten her.\nIn der TU Chemnitz kannst du das WLAN Netz %1$s verwenden.</item>