Should dependency on gallerypicker be necessary?

In a customer project that has a gallery picker in a document type, it only worked with this dependency in the pom:

<dependency>
<groupId>org.onehippo.addon.frontend.gallerypicker</groupId>
<artifactId>gallerypicker</artifactId>
</dependency>

The gallery picker is also standard in the CMS via 'add image' and then no such dependency is in the pom. This suggest that it should never be necessary to put that dependency explicitely in the pom. Is that correct and what would be the right way then?