Show empty ringtone name in case of RuntimeException

Fixes #116

app/src/main/java/org/isoron/uhabits/fragments/SettingsFragment.java

@@ -134,6 +134,7 @@ public class SettingsFragment extends PreferenceFragmentCompat
     private void updateRingtoneDescription()
     {
         String ringtoneName = ReminderHelper.getRingtoneName(getContext());
+        if(ringtoneName == null) return;
         Preference ringtonePreference = findPreference("reminderSound");
         ringtonePreference.setSummary(ringtoneName);
     }

app/src/main/java/org/isoron/uhabits/helpers/ReminderHelper.java

@@ -144,21 +144,30 @@ public class ReminderHelper
         fragment.startActivityForResult(intent, requestCode);
     }
 
+    @Nullable
     public static String getRingtoneName(Context context)
     {
-        Uri ringtoneUri = getRingtoneUri(context);
-        String ringtoneName = context.getResources().getString(R.string.none);
-
-        if(ringtoneUri != null)
+        try
         {
-            Ringtone ringtone = RingtoneManager.getRingtone(context, ringtoneUri);
-            if(ringtone != null)
+            Uri ringtoneUri = getRingtoneUri(context);
+            String ringtoneName = context.getResources().getString(R.string.none);
+
+            if (ringtoneUri != null)
             {
-                ringtoneName = ringtone.getTitle(context);
-                ringtone.stop();
+                Ringtone ringtone = RingtoneManager.getRingtone(context, ringtoneUri);
+                if (ringtone != null)
+                {
+                    ringtoneName = ringtone.getTitle(context);
+                    ringtone.stop();
+                }
             }
-        }
 
-        return ringtoneName;
+            return ringtoneName;
+        }
+        catch (RuntimeException e)
+        {
+            e.printStackTrace();
+            return null;
+        }
     }
 }