- Fix validation error message that results when submitting an empty ticket from the portal. Right now it says

Failed to convert property value of type java.lang.String to required type org.springframework.hateoas.Link for property
category; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type
java.lang.String to type @javax.validation.constraints.NotNull org.springframework.hateoas.Link for value '; nested
exception is java.lang.IllegalArgumentException: Href must not be null or empty!
