fix(llc): null check on websocket connection

[renefloor]

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Linear: fixes FLU-142

Github Issue: fixes #2218

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Description of the pull request

We have a null check operator on connectionCompleter. This can only be null if there is a disconnect while fetching a token. Now we return the connectionCompleter future before we go async, so this should never happen anymore.

We didn't reproduce it, so it's also hard to test.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.28%. Comparing base (ec653d0) to head (d1ff6b6).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2260   +/-   ##
=======================================
  Coverage   63.28%   63.28%           
=======================================
  Files         404      404           
  Lines       25268    25270    +2     
=======================================
+ Hits        15990    15992    +2     
  Misses       9278     9278           

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