archive.php should error with error code 1 also when error happens during init...

archive.php should error with error code 1 also when error happens during init eg. db connect failed

core/CronArchive.php

@@ -717,7 +717,7 @@ Notes:
         } catch (Exception $e) {
             echo "ERROR: During Piwik init, Message: " . $e->getMessage();
             //echo $e->getTraceAsString();
-            exit;
+            exit(1);
         }
     }