Revert "批量去掉叠加的空行（会生成空p标签）"

This reverts commit ed4a78fe6e5c531726fdd6ea28d12f21d4254cf9.
Revert "Revert "批量去掉叠加的空行（会生成空p标签）""

This reverts commit ed426211c9bb00748068ed3caa571cf953c062f4.