NPE when resolving referenced bean if the reference is a gallery image set in case if there is no backing HstRequestContext

When a HST bean has something like

public HippoGalleryImageSet getImage() {
        return getLinkedBean(IMAGE, HippoGalleryImageSet.class);
}

then when this getImage is invoked but there is not HstRequestContext on the thread local, the NPE below happens

hst content beans should always also work without HstRequestContext

INFO] [talledLocalContainer] 23.05.2019 17:10:11 ERROR
ThreadPoolTaskScheduler-1 [DynamicObjectConverterImpl.getObject:138] e
[INFO] [talledLocalContainer] java.lang.NullPointerException: null
[INFO] [talledLocalContainer] at
org.hippoecm.hst.content.beans.dynamic.DynamicBeanDefinitionService.getGalleryImageSetTypeClass(DynamicBeanDefinitionService.java:212)
~[hst-content-beans-13.2.1-contentfeed-SNAPSHOT.jar:13.2.1-contentfeed-SNAPSHOT]
[INFO] [talledLocalContainer] at
org.hippoecm.hst.content.beans.dynamic.DynamicBeanDefinitionService.addBeanMethodImageLink(DynamicBeanDefinitionService.java:244)
~[hst-content-beans-13.2.1-contentfeed-SNAPSHOT.jar:13.2.1-contentfeed-SNAPSHOT]
[INFO] [talledLocalContainer] at
org.hippoecm.hst.content.beans.builder.AbstractBeanBuilderService.generateMethodsByNodes(AbstractBeanBuilderService.java:159)
~[hst-content-beans-13.2.1-contentfeed-SNAPSHOT.jar:13.2.1-contentfeed-SNAPSHOT]
[INFO] [talledLocalContainer] at
org.hippoecm.hst.content.beans.dynamic.DynamicBeanDefinitionService.generateBeanDefinition(DynamicBeanDefinitionService.java:150)
~[hst-content-beans-13.2.1-contentfeed-SNAPSHOT.jar:13.2.1-contentfeed-SNAPSHOT]
[INFO] [talledLocalContainer] at
org.hippoecm.hst.content.beans.dynamic.DynamicBeanDefinitionService.createDocumentBeanDef(DynamicBeanDefinitionService.java:88)
~[hst-content-beans-13.2.1-contentfeed-SNAPSHOT.jar:13.2.1-contentfeed-SNAPSHOT]
[INFO] [talledLocalContainer] at
org.hippoecm.hst.content.beans.dynamic.DynamicBeanDefinitionService.createDocumentBeanDef(DynamicBeanDefinitionService.java:80)
~[hst-content-beans-13.2.1-contentfeed-SNAPSHOT.jar:13.2.1-contentfeed-SNAPSHOT]
[INFO] [talledLocalContainer] at
org.hippoecm.hst.content.beans.manager.DynamicObjectConverterImpl.createDynamicBeanDefinition(DynamicObjectConverterImpl.java:164)
~[hst-content-beans-13.2.1-contentfeed-SNAPSHOT.jar:13.2.1-contentfeed-SNAPSHOT]
[INFO] [talledLocalContainer] at
org.hippoecm.hst.content.beans.manager.DynamicObjectConverterImpl.createDynamicBeanDefinition(DynamicObjectConverterImpl.java:153)
~[hst-content-beans-13.2.1-contentfeed-SNAPSHOT.jar:13.2.1-contentfeed-SNAPSHOT]
[INFO] [talledLocalContainer] at
org.hippoecm.hst.content.beans.manager.DynamicObjectConverterImpl.getObject(DynamicObjectConverterImpl.java:122)
[hst-content-beans-13.2.1-contentfeed-SNAPSHOT.jar:13.2.1-contentfeed-SNAPSHOT]
[INFO] [talledLocalContainer] at
org.hippoecm.hst.content.beans.standard.HippoMirror.getReferencedBean(HippoMirror.java:73)
[hst-content-beans-13.2.1-contentfeed-SNAPSHOT.jar:13.2.1-contentfeed-SNAPSHOT]
[INFO] [talledLocalContainer] at