UNOTOPLYS-325 : Evolution de la regex de validation des références.

src/main/java/com/unantes/orientactive/validation/ValidationUtils.java

@@ -7,7 +7,7 @@ import com.unantes.orientactive.web.rest.errors.InvalidReferenceException;
 
 public class ValidationUtils {
 
-    public static Pattern PATTERN_REFERENCE = Pattern.compile("^[a-zA-Z]+[a-zA-Z0-9_]+$");
+    public static Pattern PATTERN_REFERENCE = Pattern.compile("^[a-zA-Z]+[a-zA-Z0-9_]*$");
     public static String RESERVED_SEPARATOR = "__";
 
     public static void validateReference(final String reference) {