MD Settings: Fix networking config errors

chrome/browser/resources/settings/internet_page/internet_detail_page.js

Index: chrome/browser/resources/settings/internet_page/internet_detail_page.js
diff --git a/chrome/browser/resources/settings/internet_page/internet_detail_page.js b/chrome/browser/resources/settings/internet_page/internet_detail_page.js
index 760db46b12bb8dc04ce4cc261f140da8efee0e0e..ef74fd58e9a3f81d343047e79d349016b95633d8 100644
--- a/chrome/browser/resources/settings/internet_page/internet_detail_page.js
+++ b/chrome/browser/resources/settings/internet_page/internet_detail_page.js
@@ -267,12 +267,24 @@ Polymer({
    * @private
    */
   getPropertiesCallback_: function(properties) {
-    this.networkProperties = properties;
+    if (chrome.runtime.lastError) {
+      var message = chrome.runtime.lastError.message;
+      if (message == 'Error.InvalidNetworkGuid') {
+        console.error('Details page: GUID no longer exists: ' + this.guid);
+      } else {
+        console.error(
+            'Unexpected networkingPrivate.getManagedProperties error: ' +
+            message + ' For: ' + this.guid);
+      }
+      this.close_();
+      return;
+    }
     if (!properties) {
-      // If |properties| is null, the network is no longer visible, close this.
-      console.error('Network no longer exists: ' + this.guid);
+      console.error('No properties for: ' + this.guid);
       this.close_();
+      return;
     }
+    this.networkProperties = properties;
   },
 
   /**