[FIX] protect import if module is not present (#818)

* [FIX] Protect import for uninstalled module

account_move_batch_validate/__init__.py

@@ -1,6 +1,13 @@
 # -*- coding: utf-8 -*-
 # Copyright 2014 Camptocamp SA, 2017 ACSONE
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
-
-from . import models
-from . import wizard
+try:
+    from odoo.addons.queue_job.job \
+        import job, Job
+except (ImportError, IOError) as err:
+    import logging
+    _logger = logging.getLogger(__name__)
+    _logger.debug(err)
+else:
+    from . import models
+    from . import wizard