The expression "thoughts without content are empty" in Critique of Pure Reason B75

What is it about?

The expression "thoughts without content are empty" in the Critique of Pure Reason seems to be just a tautology. Instead it expresses a new conception of "concept", quite different from the Leibnizian theory. According to Leibniz, a well constructed concept cannot be empty, since Logic necessarily bears a relation to its own content. According to Kant, it is possible that there are empty concepts, no matters how well constructed they may be, since it takes intuition for a concept having some content.

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Why is it important?

The article introduces and explains the conception of "empty concept", which was not thinkable in pre-kantian Logic