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java.lang.NullPointerException: null value	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:204)	at com.google.common.collect.ImmutableMap.entryOf(ImmutableMap.java:139)	at com.google.common.collect.ImmutableMap$Builder.put(ImmutableMap.java:178)	at com.atlassian.jira.plugins.webhooks.mapper.EventTypeInfoDecorator.toMap(EventTypeInfoDecorator.java:28)	at com.atlassian.jira.plugins.webhooks.impl.JiraEventSerializerFactory.create(JiraEventSerializerFactory.java:52)	at com.atlassian.jira.plugins.webhooks.impl.JiraEventSerializerFactory.create(JiraEventSerializerFactory.java:27)	at com.atlassian.jira.plugins.webhooks.WebHookRegistration.getEventSerializer(WebHookRegistration.java:39)