Backport !837 “gs-app-row: Allow NULL size groups in gs_app_row_set_size_groups()” to gnome-40
The gs_update_list_add_app() explicitly calls gs_app_row_set_size_groups() with one argument NULL, which generates a runtime warning when opening list of history updates (gnome-software --mode=updated).
Trivial backport of !837 (merged) to gnome-40
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