libzutil: zfs_isnumber(): return false if input empty

zpool list, which is the only user, would mistakenly try to parse the
empty string as the interval in this case:

  $ zpool list "a"
  cannot open 'a': no such pool
  $ zpool list ""
  interval cannot be zero
  usage: <usage string follows>
which is now symmetric with zpool get:
  $ zpool list ""
  cannot open '': name must begin with a letter

Avoid breaking the  "interval cannot be zero" string.
There simply isn't a need for this, and it's user-facing.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11841 
Closes #11843

lib/libzutil/zutil_nicenum.c

@@ -35,6 +35,9 @@
 boolean_t
 zfs_isnumber(const char *str)
 {
+	if (!*str)
+		return (B_FALSE);
+
 	for (; *str; str++)
 		if (!(isdigit(*str) || (*str == '.')))
 			return (B_FALSE);