Loot tables in The Division are configuration files that determine the possible loot that can be received when completing missions / assignments, killing enemies, opening containers and vendor inventory (resets based on restock interval).
They are broken up into groups with each group having a chance (default is 100%) that an item will be rewarded within that group. Within groups can be sets of items with a Drop Weight, which is determines the likelihood that the item set will be selected as the reward for the group. To determine the actual drop percentage, you take the drop weight for an item set and divide it by the total drop weight for all item sets in the group.
Loot Table Name: loot_table_empty