Fix NPE in RecordingPreconditions

common/src/main/java/ctbrec/recorder/RecordingPreconditions.java

@@ -121,7 +121,7 @@ public class RecordingPreconditions {
             }
         }
         if (isForced || (lowestPrio < priority)) {
-            return Optional.of(lowest);
+            return Optional.ofNullable(lowest);
         } else {
             return Optional.empty();
         }