foam.u2.DetailView: Update actions expression to not fail if 'of' isn't set yet.
foam.u2.DetailView: Update actions expression to not fail if 'of'
isn't set yet.

Re-render if actions changes.

foam-framework/foam2,jacksonic/vjlofvhjfgm,foam-framework/foam2,TanayParikh/foam2,jacksonic/vjlofvhjfgm,TanayParikh/foam2,foam-framework/foam2,foam-framework/foam2,TanayParikh/foam2,TanayParikh/foam2,foam-framework/foam2,jacksonic/vjlofvhjfgm