Eliminated unwanted PEAR references.

module/VuFind/src/VuFind/ILS/Driver/MultiBackend.php

@@ -1026,7 +1026,8 @@ class MultiBackend extends AbstractBase
      * Place ILL Request
      *
      * Attempts to place an ILL request on a particular item and returns
-     * an array with result details or a PEAR error on failure of support classes
+     * an array with result details (or throws an exception on failure of support
+     * classes)
      *
      * @param array $details An array of item and patron data
      *

module/VuFind/src/VuFind/ILS/Driver/VoyagerRestful.php

@@ -1039,7 +1039,7 @@ class VoyagerRestful extends Voyager implements \VuFindHttp\HttpServiceAwareInte
             $sqlStmt = $this->db->prepare($sql['string']);
             $sqlStmt->execute($sql['bind']);
         } catch (PDOException $e) {
-            return new PEAR_Error($e->getMessage());
+            throw new ILSException($e->getMessage());
         }
 
         $groups = [];