lock_timeout cannot be nil

[thatsanicehat]

Describe the bug

In version 7.1.12, setting lock_timeout to nil for a given worker to ensure the queue waits indefinitely as described in the docs causes an exception

Expected behavior
Setting lock_timeout to nil should continuously re-enqueue the job until it can be picked up.

Current behavior

NoMethodError: undefined method `+' for nil:NilClass (Most recent call first)

File /app/vendor/bundle/ruby/2.7.0/gems/sidekiq-unique-jobs-7.1.12/lib/sidekiq_unique_jobs/locksmith.rb line 327 in drift
(val + 2).to_f * CLOCK_DRIFT_FACTOR
File /app/vendor/bundle/ruby/2.7.0/gems/sidekiq-unique-jobs-7.1.12/lib/sidekiq_unique_jobs/locksmith.rb line 331 in add_drift
val + drift(val)
File /app/vendor/bundle/ruby/2.7.0/gems/sidekiq-unique-jobs-7.1.12/lib/sidekiq_unique_jobs/locksmith.rb line 244 in primed_async
.value(add_drift(wait || config.timeout))
File /app/vendor/bundle/ruby/2.7.0/gems/sidekiq-unique-jobs-7.1.12/lib/sidekiq_unique_jobs/locksmith.rb line 196 in call
primed_method.call(conn, wait) do |primed_jid|
File /app/vendor/bundle/ruby/2.7.0/gems/sidekiq-unique-jobs-7.1.12/lib/sidekiq_unique_jobs/locksmith.rb line 196 in block in lock!
primed_method.call(conn, wait) do |primed_jid|
File /app/vendor/bundle/ruby/2.7.0/gems/sidekiq-unique-jobs-7.1.12/lib/sidekiq_unique_jobs/locksmith.rb line 228 in enqueue
yield job_id
File /app/vendor/bundle/ruby/2.7.0/gems/sidekiq-unique-jobs-7.1.12/lib/sidekiq_unique_jobs/locksmith.rb line 193 in lock!
enqueue(conn) do |queued_jid|
File /app/vendor/bundle/ruby/2.7.0/gems/sidekiq-unique-jobs-7.1.12/lib/sidekiq_unique_jobs/locksmith.rb line 105 in block in execute
lock!(conn, method(:primed_async), &block)

Worker class

class Ops::Scanlite::DisplayPicksWorker < ApplicationWorker
  include Sidekiq::Worker
  sidekiq_options lock: :while_executing, lock_args_method: :lock_args, lock_timeout: nil, retry: false, queue: :dxm

  private

  def self.lock_args(args)
    [args[0]]
  end
end