The camera app checks the result of 
QCameraFlashControl::isFlashModeSupported(...)
http://doc.qt.io/qt-5/qcameraflashcontrol.html#isFlashModeSupported

It considers a flash is available if:
isFlashModeSupported(QCameraExposure::FlashAuto) && 
isFlashModeSupported(QCameraExposure::FlashOff) && 
isFlashModeSupported(QCameraExposure::FlashOn);

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https://bugs.launchpad.net/bugs/1542094

Title:
  [camera] LED & Flash toggles are shown even when no LED or Flash
  present on hardware

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