Fix NPE from monkey run

Bug: 5037499
Change-Id: Ic12fab174d19b759899ce8b3f92f202f549e7c00
diff --git a/src/com/android/settings/wifi/WifiConfigController.java b/src/com/android/settings/wifi/WifiConfigController.java
index 897280f..876fd99 100644
--- a/src/com/android/settings/wifi/WifiConfigController.java
+++ b/src/com/android/settings/wifi/WifiConfigController.java
@@ -112,8 +112,8 @@
     private TextView mProxyPortView;
     private TextView mProxyExclusionListView;
 
-    private IpAssignment mIpAssignment;
-    private ProxySettings mProxySettings;
+    private IpAssignment mIpAssignment = IpAssignment.UNASSIGNED;
+    private ProxySettings mProxySettings = ProxySettings.UNASSIGNED;
     private LinkProperties mLinkProperties = new LinkProperties();
 
     // True when this instance is used in SetupWizard XL context.