Don't show Wi-Fi icon if the level is -1

Bug: 195893448
Test: manual test
make RunSettingsRoboTests
ROBOTEST_FILTER=NetworkRequestDialogFragmentTest

Change-Id: Ifddc9aace42d1f024b7c861b1207f651061d790b
(cherry picked from commit 7e14668094ddb26f726f5282456b10afd11b75c5)
Merged-In: Ifddc9aace42d1f024b7c861b1207f651061d790b
diff --git a/src/com/android/settings/wifi/NetworkRequestDialogFragment.java b/src/com/android/settings/wifi/NetworkRequestDialogFragment.java
index cbc89ae..5fe156c 100644
--- a/src/com/android/settings/wifi/NetworkRequestDialogFragment.java
+++ b/src/com/android/settings/wifi/NetworkRequestDialogFragment.java
@@ -330,7 +330,7 @@
 
             final PreferenceImageView imageView = view.findViewById(android.R.id.icon);
             final int level = wifiEntry.getLevel();
-            if (imageView != null) {
+            if (imageView != null && level != WifiEntry.WIFI_LEVEL_UNREACHABLE) {
                 final Drawable drawable = getContext().getDrawable(
                         Utils.getWifiIconResource(level));
                 drawable.setTintList(