DUO: Moratorium field date check fails

[Macroz]

If you create a resource with DUO moratorium (MOR) field, when you apply for it and add MOR, then after the autosave the validation fails with the following error:

2022-11-10 17:03:24,721 [jetty-handlers-159 frank GET /api/applications/1017] ERROR compojure.api.exception - No implementation of method: :equal? of protocol: #'clj-time.core/DateTimeProtocol found for class: nil
java.lang.IllegalArgumentException: No implementation of method: :equal? of protocol: #'clj-time.core/DateTimeProtocol found for class: nil
	at clojure.core$_cache_protocol_fn.invokeStatic(core_deftype.clj:584)
	at clojure.core$_cache_protocol_fn.invoke(core_deftype.clj:576)
	at clj_time.core$eval9555$fn__9729$G__9530__9736.invoke(core.clj:102)
	at rems.ext.duo$check_duo_code.invokeStatic(duo.clj:226)
	at rems.ext.duo$check_duo_code.invoke(duo.clj:203)
	at rems.application.model$validate_duo_match.invokeStatic(model.clj:482)
	```