Fix Private Potato Error if no Private Boards

[Alan Beam]

If the user doesn't have access to any private boards, the following console error may be thrown:

Uncaught TypeError: Cannot read property 'getElementsByTagName' of undefined at XMLHttpRequest.httpotato.onreadystatechange (blab.js:400)

[Alan Beam]

Add the following to line 399 of blab.js:

if (x.length == 0) return;

[Alan Beam]

Pending PR

[Alan Beam]

Merged in 10-chat-ppot-no-private-boards (pull request #4)

Resolve #10

Ignore private potato if no private boards (#10)

→ <<cset 5dc5a13f9daa>>