1.43-1.43.1: shows a "broken pipe" error message if output is truncated

[simonmichael]

This started with 1.43. It happens only with data above a certain size.

$ hledger-1.42 -f examples/1ktxns-1kaccts.journal print | head -1
2000-01-01 transaction 1

$ hledger-1.43 -f examples/100txns-100accts.journal print | head -1
2000-01-01 transaction 1

$ hledger-1.43 -f examples/1ktxns-1kaccts.journal print | head -1
2000-01-01 transaction 1
hledger-1.43: Error: <stdout>: commitBuffer: resource vanished (Broken pipe)