From 0fb73d07d24154b8a3b14c54faf164a5e5e92a2f Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Tue, 12 Mar 2019 11:47:04 -0400
Subject: ob_set_substvar(): Make validation more immediately clear

The original version in 000a27ff used a "${parameter:-word}" default
value expansion to detect an empty string.  Instead, let the case
construct match empty strings directly.
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