Log fixes (#2972)

* Make sure we set target_type when creating an accept asset log, and add a migration to fix older ones.

* On a declined log, we don't have an assigned user.

 Guard against this conditional (which realistically should never be hit?)
Should fix #2940

* Fix codacy issues with migration.

app/Http/Controllers/ViewAssetsController.php

@@ -379,6 +379,7 @@ class ViewAssetsController extends Controller
         }
 
         $logaction->target_id = $findlog->target_id;
+        $logaction->target_type = User::class;
         $logaction->note = e(Input::get('note'));
         $logaction->updated_at = date("Y-m-d H:i:s");