Add send email when no records option.

This commit refs #11592

electronic_mail.py

@@ -162,6 +162,10 @@ class ElectronicMailFilter(DeactivableMixin, ModelSQL, ModelView):
                 template = fltr.template
                 records = fltr.search_records()
                 if not records:
+                    if not template.no_records_email:
+                        continue
+                    records.append(fltr)
+                elif template.no_records_email:
                     continue
 
                 group_records = (getattr(template, 'single_email', False) and

locale/es.po

@@ -1,4 +1,4 @@
-# 
+#
 msgid ""
 msgstr "Content-Type: text/plain; charset=utf-8\n"
 
@@ -98,6 +98,10 @@ msgctxt "field:electronic.mail.template,filters:"
 msgid "Filters"
 msgstr "Filtros"
 
+msgctxt "field:electronic.mail.template,no_records_email:"
+msgid "Send email when no records"
+msgstr "Enviar correo si no hay resultados"
+
 msgctxt "field:electronic.mail.template,reply_to:"
 msgid "Reply To"
 msgstr "Responder a"

template.py

@@ -8,7 +8,7 @@ except ImportError:
 from email.mime.base import MIMEBase
 from trytond.model import fields
 from trytond.pool import PoolMeta, Pool
-
+from trytond.pyson import Eval
 
 __all__ = ['Template']
 
@@ -18,9 +18,23 @@ class Template(metaclass=PoolMeta):
 
     filters = fields.One2Many('electronic.mail.filter', 'template',
         'Filters')
+    no_records_email = fields.Boolean('Send email when no records')
+
+    @classmethod
+    def __setup__(cls):
+        super().__setup__()
+        if cls.reports.states.get('invisible'):
+            cls.reports.states['invisible'] |= Eval('no_records_email')
+        else:
+            cls.reports.states['invisible'] = Eval('no_records_email')
+        if cls.reports.states.get('readonly'):
+            cls.reports.states['readonly'] |= Eval('no_records_email')
+        else:
+            cls.reports.states['readonly'] = Eval('no_records_email')
+        cls.reports.depends.append('no_records_email')
 
     def get_attachments(self, records):
-        record_ids = [r.id for r in records]
+        record_ids = [r.id for r in records if r]
         attachments = []
         for report in self.reports:
             report = Pool().get(report.report_name, type='report')
@@ -41,3 +55,8 @@ class Template(metaclass=PoolMeta):
                 'Content-Disposition', 'attachment', filename=filename)
             attachments.append(attachment)
         return attachments
+
+    @fields.depends('no_records_email')
+    def on_change_no_records_email(self):
+        if self.no_records_email:
+            self.reports = []

view/electronic_mail_template_form.xml

@@ -3,6 +3,10 @@
 The COPYRIGHT file at the top level of this repository contains the full
 copyright notices and license terms. -->
 <data>
+    <xpath expr="/form/notebook" position="before">
+        <label name="no_records_email"/>
+        <field name="no_records_email"/>
+    </xpath>
     <xpath expr="/form/notebook/page[@id='advanced']" position="after">
         <page string="Filters" id="filters">
             <label name="filters"/>