[FIX] report: catch missing wkhtml error

If wkhtmltopdf is missing, a call to a report will be catched to warn the user.
In case of a report generated indirectly (e.g. via an attachment on an email
template), the rendering would crash.

As warning the user is better than returning a traceback, raise a UserError.

Closes #14535

addons/report/i18n/report.pot

@@ -6,8 +6,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Odoo Server 9.0c\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2016-06-09 11:58+0000\n"
-"PO-Revision-Date: 2016-06-09 11:58+0000\n"
+"POT-Creation-Date: 2016-12-07 10:39+0000\n"
+"PO-Revision-Date: 2016-12-07 10:39+0000\n"
 "Last-Translator: <>\n"
 "Language-Team: \n"
 "MIME-Version: 1.0\n"
@@ -461,13 +461,19 @@ msgid "Unable to find Wkhtmltopdf on this \n"
 "wkhtmltopdf.org</a>"
 msgstr ""
 
+#. module: report
+#: code:addons/report/models/report.py:164
+#, python-format
+msgid "Unable to find Wkhtmltopdf on this system. The PDF can not be created."
+msgstr ""
+
 #. module: report
 #: model:ir.ui.view,arch_db:report.external_layout_footer
 msgid "Website:"
 msgstr ""
 
 #. module: report
-#: code:addons/report/models/report.py:430
+#: code:addons/report/models/report.py:464
 #, python-format
 msgid "Wkhtmltopdf failed (error code: %s). Message: %s"
 msgstr ""

addons/report/models/report.py

@@ -155,6 +155,14 @@ class Report(osv.Model):
     def get_pdf(self, cr, uid, ids, report_name, html=None, data=None, context=None):
         """This method generates and returns pdf version of a report.
         """
+
+        if self._check_wkhtmltopdf() == 'install':
+            # wkhtmltopdf is not installed
+            # the call should be catched before (cf /report/check_wkhtmltopdf) but
+            # if get_pdf is called manually (email template), the check could be
+            # bypassed
+            raise UserError(_("Unable to find Wkhtmltopdf on this system. The PDF can not be created."))
+
         if context is None:
             context = {}