refs #16630 * bug fixing if empty isbn or zbd

res/theme/languages/en.ini

 boss_default = "Please add a home library in your profile to obtain information about the availability of this title on site."
-boss_true = "available in your home library."
+boss_true = "available in your library"
 boss_false = "Not available in your home library.<br/><br/>Your home library can tell you whether the title can be ordered by interlibrary loan."
 boss_noISXNZBD = "Unfortunately, we cannot provide any further information on availability for this title at the moment.<br/><br/>Your home library can tell you whether the title can be ordered by interlibrary loan."
 boss_note = "Important note"

src/AjaxHandler/GetBoss.php

@@ -167,16 +167,17 @@ class GetBoss extends \VuFind\AjaxHandler\AbstractBase
             $zdbId = $driver->tryMethod('getZdbId');
             $isbns = $driver->tryMethod('getISBNs');
             $isbns = count($isbns) > 0 ? $isbns[0] : '';
+            $isISXNZBD = (!empty($isbns) || !empty($zdbId)) ? true : false;
             $tmp = $isilCallNumber;
             unset($tmp['isils']);
             $callnumber = $this->getCallnumbers($boss, $tmp);
 
-            $isISIL = $inArray ?
+            $isISIL = $inArray && $isISXNZBD ?
                 $this->isISIL($isilCallNumber['isils'], $boss) : false;
 
             $view = [
                 'homeLibrary' => ($homeLibrary == "AAAAA") ? true : false,
-                'isISXNZBD' => (!empty($isbns) || !empty($zdbId)) ? true : false,
+                'isISXNZBD' => $isISXNZBD,
                 'isISIL' => $isISIL,
                 'isAddNetwork' => in_array($network, $addNetworks) ? true : false,
                 'url' => sprintf($this->config->SearchUrls->$network, ($inArray ?