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java.lang.IllegalArgumentException: Rel must not be null or empty!	at org.springframework.util.Assert.hasText(Assert.java:162)	at org.springframework.hateoas.Link.(Link.java:88)	at org.springframework.hateoas.Link.(Link.java:76)	at org.springframework.data.rest.webmvc.RepositorySearchController.getSearchLinks(RepositorySearchController.java:247)	at org.springframework.data.rest.webmvc.RepositorySearchController.listSearches(RepositorySearchController.java:108)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)