Sanity check for system service restarts.

src/org/thoughtcrime/securesms/service/ApplicationMigrationService.java

@@ -34,6 +34,8 @@ public class ApplicationMigrationService extends Service
 
   @Override
   public void onStart(Intent intent, int startId) {
+    if (intent == null) return;
+
     if (intent.getAction() != null && intent.getAction().equals(MIGRATE_DATABASE)) {
       handleDatabaseMigration((MasterSecret)intent.getParcelableExtra("master_secret"));
     }

src/org/thoughtcrime/securesms/service/KeyCachingService.java

@@ -75,6 +75,8 @@ public class KeyCachingService extends Service {
 
   @Override
   public void onStart(Intent intent, int startId) {
+    if (intent == null) return;
+
     if (intent.getAction() != null && intent.getAction().equals(CLEAR_KEY_ACTION))
       handleClearKey();
     else if (intent.getAction() != null && intent.getAction().equals(ACTIVITY_START_EVENT))

src/org/thoughtcrime/securesms/service/SendReceiveService.java

@@ -16,14 +16,6 @@
  */
 package org.thoughtcrime.securesms.service;
 
-import java.util.Iterator;
-import java.util.LinkedList;
-import java.util.List;
-
-import org.thoughtcrime.securesms.crypto.MasterSecret;
-import org.thoughtcrime.securesms.database.CanonicalSessionMigrator;
-import org.thoughtcrime.securesms.util.WorkerThread;
-
 import android.app.Service;
 import android.content.BroadcastReceiver;
 import android.content.ComponentName;
@@ -33,11 +25,18 @@ import android.content.IntentFilter;
 import android.content.ServiceConnection;
 import android.os.Handler;
 import android.os.IBinder;
-import android.os.Looper;
 import android.os.Message;
 import android.util.Log;
 import android.widget.Toast;
 
+import org.thoughtcrime.securesms.crypto.MasterSecret;
+import org.thoughtcrime.securesms.database.CanonicalSessionMigrator;
+import org.thoughtcrime.securesms.util.WorkerThread;
+
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+
 /**
  * Services that handles sending/receiving of SMS/MMS.
  *
@@ -86,6 +85,8 @@ public class SendReceiveService extends Service {
 
   @Override
   public void onStart(Intent intent, int startId) {
+    if (intent == null) return;
+
     if (intent.getAction().equals(SEND_SMS_ACTION))
       scheduleSecretRequiredIntent(SEND_SMS, intent);
     else if (intent.getAction().equals(RECEIVE_SMS_ACTION))