Fix some misc issues

mobile/src/main/java/be/mygod/vpnhotspot/manage/ManageBar.kt

@@ -22,8 +22,12 @@ object ManageBar : Manager() {
             context.startActivity(Intent()
                     .setClassName("com.android.settings", "com.android.settings.Settings\$TetherSettingsActivity"))
         } catch (e: ActivityNotFoundException) {
-            context.startActivity(Intent()
-                    .setClassName("com.android.settings", "com.android.settings.TetherSettings"))
+            try {
+                context.startActivity(Intent()
+                        .setClassName("com.android.settings", "com.android.settings.TetherSettings"))
+            } catch (e: ActivityNotFoundException) {
+                e.printStackTrace()
+            }
         }
     }
 }

mobile/src/main/java/be/mygod/vpnhotspot/manage/TetherManager.kt

@@ -6,6 +6,7 @@ import android.arch.lifecycle.LifecycleObserver
 import android.arch.lifecycle.OnLifecycleEvent
 import android.bluetooth.BluetoothAdapter
 import android.bluetooth.BluetoothProfile
+import android.content.ActivityNotFoundException
 import android.content.Intent
 import android.databinding.BaseObservable
 import android.net.Uri
@@ -40,10 +41,12 @@ abstract class TetherManager private constructor(protected val parent: Tethering
         override fun onClick(v: View?) {
             val manager = manager!!
             val context = manager.parent.requireContext()
-            if (Build.VERSION.SDK_INT >= 23 && !Settings.System.canWrite(context)) {
+            if (Build.VERSION.SDK_INT >= 23 && !Settings.System.canWrite(context)) try {
                 manager.parent.startActivity(Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS,
                         Uri.parse("package:${context.packageName}")))
                 return
+            } catch (exc: ActivityNotFoundException) {
+                exc.printStackTrace()
             }
             val started = manager.isStarted
             try {

mobile/src/main/java/be/mygod/vpnhotspot/manage/TetheringFragment.kt

@@ -95,6 +95,7 @@ class TetheringFragment : Fragment(), ServiceConnection {
         binding.interfaces.layoutManager = LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false)
         binding.interfaces.itemAnimator = DefaultItemAnimator()
         binding.interfaces.adapter = adapter
+        adapter.update(emptyList(), emptyList())
         ServiceForegroundConnector(this, this, TetheringService::class)
         return binding.root
     }