[FIX] stock_account: group on empty field

65;5401;1c
Line contains the value returned by a select clause on inventory lines.
postgresql result returns None instead of False when no value is set.

Avoid having a stock_histories_by_group dict with a key to None

Having a None value is problematic as the key is used based on the read_group
result returned by the super call above.

e.g. grouping the inventory history by lot numbers, while some moves have no
inventory, used to produce a KeyError

Closes #27591

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