[EPNG] TableEx & IE8: Unknown runtime error

In IE8, we're seeing an "Unknown runtime error" when clicking on cells in a TableEx.
The problem appears to only occur in one particular table of the app

Message: Unknown runtime error
Line: 1
Char: 1
Code: 0
URI: http://demo.openvpms.org/openvpms/app/2

Using DebugBar, it reports the error occuring at line 260 (of tableex.js):


This is part of the EPTableEx.prototype.processClick function.

A quick search seems to indicate that this is an IE8 bug, perhaps to do with a selection being present, but not visible.
One workaround is to swallow the exception:

if (document.selection && document.selection.empty) {
try {
} catch (error) {
    // ignore error to as a workaround for bug in IE8

Is anyone maintaining echopointng any longer? I'd rather not have to fork it to make the above change.