Fix crash when changing contact color without contacts permission.

On mulit-device app, after the contact color is changed, a multi-device
contact update job is triggered, which tries to access the system
avatar.
This causes a crash if the user has revoked the contacts permission.

app/src/main/java/org/thoughtcrime/securesms/jobs/MultiDeviceContactUpdateJob.java

@@ -1,5 +1,6 @@
 package org.thoughtcrime.securesms.jobs;
 
+import android.Manifest;
 import android.content.res.AssetFileDescriptor;
 import android.database.Cursor;
 import android.net.Uri;
@@ -20,6 +21,7 @@
 import org.thoughtcrime.securesms.jobmanager.Data;
 import org.thoughtcrime.securesms.jobmanager.Job;
 import org.thoughtcrime.securesms.jobmanager.impl.NetworkConstraint;
+import org.thoughtcrime.securesms.permissions.Permissions;
 import org.thoughtcrime.securesms.profiles.AvatarHelper;
 import org.thoughtcrime.securesms.providers.BlobProvider;
 import org.thoughtcrime.securesms.recipients.Recipient;
@@ -304,7 +306,11 @@ private Optional<SignalServiceAttachmentStream> getSystemAvatar(@Nullable Uri ur
     if (uri == null) {
       return Optional.absent();
     }
-
+
+    if (!Permissions.hasAny(context, Manifest.permission.READ_CONTACTS, Manifest.permission.WRITE_CONTACTS)) {
+      return Optional.absent();
+    }
+
     Uri displayPhotoUri = Uri.withAppendedPath(uri, ContactsContract.Contacts.Photo.DISPLAY_PHOTO);
 
     try {