The light in my GE microwave quit coming on so after pulling the case apart
to get at it (great design, guys!), the filament of this 25 watt plug in
bulb looks intact. However, a meter across the two male terminal spades
shows no continuity.

There's power at the connector supplying the light when the door is open or
the oven is running-- so that's not the problem. Could the bulb be bad even
when it shows continuity?