fix: don't attempt to update language client config if there is no language client [IDE-844] #249
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Description
When cancelling the authentication wizard, the wizard attempts to reset preferences and update the language client config. If this happens before the CLI has downloaded, the language client config update fails with an null pointer exception, which interrupts the cancellation and so the wizard never closes.
This fix checks that the client is not null before attempting to update it.
Checklist
Screenshots / GIFs
(Just imagine the space where the authentication wizard used to be 😜)