#4692 Unnecessary bad beam warning

[Palmer Ralph]

Simon Albrecht wrote :

maybe Lily should not give a ‘no viable initial configuration found: may not find good beam slope’ warning if the user has already taken care of the problem through the Beam’s positions property:

:::TeX
\version "2.19.32"
{
  \stemUp g'8-\offset positions #'(-1 . .3) [ \stemDown e'']
}