[bug] Inline style sheet over multiple lines causes crash

[d.healey]

This, no crash

const laf = Content.createLocalLookAndFeel();
laf.setInlineStyleSheet("");

This, crash (segfault)

const laf = Content.createLocalLookAndFeel();
laf.setInlineStyleSheet("
");

[Christoph Hart]

@d-healey ah yeah that one was bugging me too. Fixed now.