Fix `jakarta.persistence.PersistenceException: Error attempting to apply

AttributeConverter`

src/main/java/com/redhat/pctsec/model/jpa/UriConverter.java

@@ -17,6 +17,8 @@ public class UriConverter implements AttributeConverter<URI, String>
 
     @Override
     public URI convertToEntityAttribute(String s) {
+        if(s != null)
             return ((s.length() > 0) ? URI.create(s.trim()) : null);
+        return null;
     }
 }