Wifi: Update message when scan result is empty

Handle case when Wi-Fi scan result is empty

Change-Id: I03ccbf2603367efa3c6dfe20514e8c7c5a68b5d9
Signed-off-by: Vishal Mahaveer <vishalm@ti.com>

src/com/android/settings/wifi/WifiSettings.java

@@ -538,6 +538,9 @@ public class WifiSettings extends SettingsPreferenceFragment
                     ((WifiSettingsForSetupWizardXL)getActivity()).onAccessPointsUpdated(
                             getPreferenceScreen(), accessPoints);
                 } else {
+                    if(accessPoints.size() == 0) {
+                        addMessagePreference(R.string.wifi_empty_list_wifi_on);
+                    }
                     for (AccessPoint accessPoint : accessPoints) {
                         getPreferenceScreen().addPreference(accessPoint);
                     }