AutoGrid helper for displaying OU fields assumes null not possible

[Lebbeous Fogle-Weekley]

Evergreen master:

If you're using AutoGrid to deliver an interface for a given class, and that class has aou-linked fields that can potentially be null, and if you use the helper function orgUnitGetter in the AutoGrid markup like so:

<thead>
  <tr field="maybe_lib" get="openils.widget.AutoGrid.orgUnitGetter"></tr>
</head>

then execution will stop whenever the orgUnitGetter() encounters a null value, when it should just return an empty string.

http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/senator/autogrid-org-unit-getter

[Mike Rylander (mrylander)]

Picked into master.