Fix NullPointerException in Monkey.

Change-Id: Ibfeb2e68826d8aff748a02cd8bd1c3c3991f9127
Fixes: b/65113577
Test: adb shell monkey -p com.android.calculator2 -p com.android.launcher -p com.google.android.launcher -p com.android.mms -p com.android.phone -p com.google.android.dialer -p com.android.providers.downloads.ui -p com.android.settings -p com.google.android.gms -p com.google.android.setupwizard -p com.google.android.packageinstaller -p com.google.android.apps.nexuslauncher -c android.intent.category.LAUNCHER --ignore-security-exceptions --monitor-native-crashes -s 19 -v -v -v 125000
1 file changed