Graham McIntire
a6a2c1cbde
The `not` operator in Elixir only works with booleans, not nil values.
When Exq process doesn't exist, Process.whereis(Exq) returns nil, causing
`:badarg` error when used with `not`.
Error:
Class=:error
Reason=:badarg
{:erlang, :not, [nil], [error_info: %{module: :erl_erts_errors}]}
Changed from:
not Process.whereis(Exq)
To:
is_nil(Process.whereis(Exq))
This properly checks if the process exists without causing runtime errors.
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