This patch is a clean-up patch for refactor-error-messages bp
which remove the exception message from base message otherwise
the same exception message display twice like
this https://ibb.co/XyFWMdz .
Depends-On: https://review.opendev.org/#/c/708069/
Change-Id: I00f3153dc3c1de65f6fe36fe444dd2d74c9fbd85