Fix NPE crash in AppInfoBase

This crash can hardly happen under the normal operation of the user,
but it may have a chance to appear in monkey test. To enhance the 
robustness of the program, intent.getData() here should not be null 
in any situations.

Bug: N/A
Test: adb shell am start -n
'com.android.settings/.Settings\$AppDrawOverlaySettingsActivity'

Change-Id: I732b564056e3e585405f146d99efe3b410edbc41
Signed-off-by: tiansiming <tiansiming@xiaomi.com>

src/com/android/settings/applications/AppInfoBase.java

@@ -138,7 +138,7 @@ public abstract class AppInfoBase extends SettingsPreferenceFragment
         if (mPackageName == null) {
             Intent intent = (args == null) ?
                     getActivity().getIntent() : (Intent) args.getParcelable("intent");
-            if (intent != null) {
+            if (intent != null && intent.getData() != null) {
                 mPackageName = intent.getData().getSchemeSpecificPart();
             }
         }