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Yes the igniter doubles as the flame sensor on this model. You can clean the electrode off with steel wool or fine sandpaper. When the electrode build up too much oxidation it can't sense the flame.
My schematic shows it connected to the terminal betwen TH & TR on the ignition control
Ok if the other end of the lead is disconnected then that's a likely culprit. It should be connected to the base p;ate of the igniter assembly.
Assuming the electrode is positioned in the flame now, the first thing I'd do is replace the igniter assembly. If that doesn't work then replace the ignition control. Be aware that a good chassis ground for both the control and the igniter is critical.
Let me know if you hae more questions.