Fix parsing of global:http_proxy value.

This caused a runtime restart for ':' and did not disable the proxy for ""
before.

Change-Id: Ib88b21e9eba5818a4968ae604abad8a3b3d1766f

services/java/com/android/server/ConnectivityService.java

@@ -3134,6 +3134,10 @@ public class ConnectivityService extends IConnectivityManager.Stub {
                 Settings.Global.HTTP_PROXY);
         if (!TextUtils.isEmpty(proxy)) {
             String data[] = proxy.split(":");
+            if (data.length == 0) {
+                return;
+            }
+
             String proxyHost =  data[0];
             int proxyPort = 8080;
             if (data.length > 1) {
@@ -3145,6 +3149,8 @@ public class ConnectivityService extends IConnectivityManager.Stub {
             }
             ProxyProperties p = new ProxyProperties(data[0], proxyPort, "");
             setGlobalProxy(p);
+        } else {
+            setGlobalProxy(null);
         }
     }