Orca stops speaking when braille display is disconnected
Steps to reproduce:
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Connect a braille display (let's say USB)
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Enable braille output in Orca.
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disconnect braille display. Notice that Orca still works.
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run orca -r - no speech
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reconnect braille display
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run orca -r - works normally again.
Expected result:
Orca should handle disconnection of braille display.