That's my point. -z is looking for a zero byte file, but 'no content' could be a bunch of tabs and spaces.
[forda@hqnagtl1 ~]$ touch emptytest1
[forda@hqnagtl1 ~]$ touch emptytest2
[forda@hqnagtl1 ~]$ ls -l emptytest*
-rw-rw-r-- 1 forda forda 0 Oct 22 17:19 emptytest1
-rw-rw-r-- 1 forda forda 0 Oct 22 17:19 emptytest2
[forda@hqnagtl1 ~]$ echo ' ' >> emptytest2
[forda@hqnagtl1 ~]$ ls -l emptytest*
-rw-rw-r-- 1 forda forda 0 Oct 22 17:19 emptytest1
-rw-rw-r-- 1 forda forda 15 Oct 22 17:20 emptytest2
I put some spaces into a formerly empty file and now it has a size of 15.
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