It doesn't make sense for some blocks like modern_industrialization:pipe to have a loot table, so I have to choose between the following 3 options atm:

• No strict validation. But then I lose automatic item model generation from block models (see #2240).
• Generate an empty loot table file. A bit annoying, generates a useless file that could mislead users who look at the jar.
• Override FabricBlockLootTableProvider#accept to remove the strict validation check. Requires an extra access widener on BlockLootTableGenerator.lootTables.