Support worker_version=False in both cache and no cache mode

Closes #124 (closed)

changed milestone to %ML Prod - August 2022 n°1

added P3 Quick Win labels

assigned to @schneider-y

requested review from @babadie

added 2 commits

• ac91877b - 1 commit from branch master
• 7d03e058 - support worker_version=False in both cache and no cache mode, add null=True to...

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merged