fix unit tests on php < 7.3

lib/Data/Database.php

@@ -233,11 +233,14 @@ class Database extends AbstractData
         }
 
         self::$_cache[$pasteid] = false;
+        try {
             $paste                  = self::_select(
                 'SELECT * FROM ' . self::_sanitizeIdentifier('paste') .
                 ' WHERE dataid = ?', array($pasteid), true
             );
-
+        } catch (Exception $e) {
+            $paste = false;
+        }
         if ($paste === false) {
             return false;
         }
@@ -643,15 +646,18 @@ class Database extends AbstractData
      * @access private
      * @static
      * @param  string $key
-     * @throws PDOException
      * @return string
      */
     private static function _getConfig($key)
     {
+        try {
             $row = self::_select(
                 'SELECT value FROM ' . self::_sanitizeIdentifier('config') .
                 ' WHERE id = ?', array($key), true
             );
+        } catch (PDOException $e) {
+            return '';
+        }
         return $row ? $row['value'] : '';
     }
 

tst/ModelTest.php

@@ -259,6 +259,7 @@ class ModelTest extends PHPUnit_Framework_TestCase
         $paste = $model->getPaste();
         $paste->setData($pasteData);
         $paste->store();
+        $paste->exists();
 
         $db = new PDO(
             $options['model_options']['dsn'],