fix ws: undefined is not an object (evaluating 'api.getInternalData(elt).webSocket.close')

[enigma]

This PR fixes #96 by checking whether webSocket is set. A similar check happens at L46 on the same file.

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[Telroshan]

Hey, thanks for the fix!
Would you mind adding a test case, to avoid any potentiel regression in the future ?
You would need to make sure the test case fails with the current state, then that it succeeds with your fix

[enigma]

Hey, thanks for the fix! Would you mind adding a test case, to avoid any potentiel regression in the future ? You would need to make sure the test case fails with the current state, then that it succeeds with your fix

Thank you @Telroshan - please take another look.

[Telroshan]

Perfect, thanks!