Fix search for Android :

- field text does not exists anymore

NetBiblio.php

@@ -630,6 +630,10 @@ class NetBiblio extends WebService
             if($this->client != 'website' && in_array($type, array('title', 'author', 'reader'))) {
                 // we don't want an exact search on mobile apps
                 $type = $type.'_fr';
+            } else if($type == 'text') {
+                // The field 'text' is still used by the Android app but does not exists anymore
+                // We use the default search fields in this case.
+                $type = null;
             }
 
             $bs->addQuery($queryArray['queryText'], $type);