Add regression-test for description-less repos

The segfault fixed in commit eacde43d71 was
triggered when the html-functions manipulated string literals. One callpatch
which could trigger the bug is in ui-repolist.c when repo descriptions are
passed to html_ntxt(): if a repo is lacking a description, the literal
string "[no description]" is used.

This patch changes test/setup.sh such that the first repo has no description,
and adds tests for both "[no description]" and "the bar repo" (description
of the other repo) to tests/t0101-index.sh, which should be enought to catch
regressions in these functions.

Noticed-by: Hiroki Hattori <seagull.kamome@gmail.com>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>

tests/setup.sh

@@ -54,7 +54,9 @@ summary-tags=5
 
 repo.url=foo
 repo.path=$PWD/trash/repos/foo/.git
-repo.desc=the foo repo
+# Do not specify a description for this repo, as it then will be assigned
+# the constant value "[no description]" (which actually used to cause a
+# segfault).
 
 repo.url=bar
 repo.path=$PWD/trash/repos/bar/.git