Removed exception for missing configurations

src/main/java/org/gcube/data/publishing/ckan2zenodo/TransformerManager.java

@@ -35,8 +35,7 @@ public class TransformerManager {
 				else return  new Translator(m);
 			}
 		}
-		throw new ConfigurationException("No specific mapping for the catalogue item has been configured. "
-				+ "By continuing with the upload some metadata might not be upload to Zenodo.");
+		return new Translator();
 	}