tables with blank headers produce "table: null" error

Creating a table with blank title headers produces a "table: null" error.

{table}
 | | 
c1a | c2a
{table}

This syntax was working up to 1.4.1. Upgrading to 1.4.2 is where I began to see this issue. I also tried 1.5.2 and 1.6.2 – the issue persists. I tested this on Netcipia and it works, so it was fixed somewhere between 1.4.2 and the version they're using.