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Do not add group values of zero to group lists. (#8751)
This fixes an issue where when the engine looked up groups (for example, in ABM node names), NodeDefManager's m_group_to_items would contain nodes with a group value of zero, resulting in nodes with flammable = 0 being burned by a fire mod with a group:flammable checking ABM. It brings consistency to the behaviour described in the api documentation, where zero and nil groups should be the same.
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