model: revert unnecessary parameter for print_summary()

model: revert unnecessary parameter for print_summary()

CycleGraph::checkForCycles() is a cheap function; it only checks a flag status.
So we don't need to make code more complicated just to avoid calling this
function.

Effectively a revert of:
commit 7cee72d776ddfbf585038f3cad3df799e353cc11