rsponse 404 when delete not exist email (#15383)

fix #15357

Signed-off-by: a1012112796 <1012112796@qq.com>

models/error.go

@@ -222,6 +222,21 @@ func (err ErrEmailInvalid) Error() string {
 	return fmt.Sprintf("e-mail invalid [email: %s]", err.Email)
 }
 
+// ErrEmailAddressNotExist email address not exist
+type ErrEmailAddressNotExist struct {
+	Email string
+}
+
+// IsErrEmailAddressNotExist checks if an error is an ErrEmailAddressNotExist
+func IsErrEmailAddressNotExist(err error) bool {
+	_, ok := err.(ErrEmailAddressNotExist)
+	return ok
+}
+
+func (err ErrEmailAddressNotExist) Error() string {
+	return fmt.Sprintf("Email address does not exist [email: %s]", err.Email)
+}
+
 // ErrOpenIDAlreadyUsed represents a "OpenIDAlreadyUsed" kind of error.
 type ErrOpenIDAlreadyUsed struct {
 	OpenID string