If you create a path to the gold with a blue door in the way, and there are no blue dwarves, no boss, and no profiteer, what happens?
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The game designer, Frederic Moyersoen, discusses the answer to that question on BGG (emphasis mine).
If there is a path with a blue door, the blue gold-diggers win (and not the green). If there are no blue gold-diggers, no profiteur and no boss, nobody wins.