[FIX] stock_account: Post install should check for all companies and not always create

The method will check all companies with a chart of account if they have a property for the stock journal.
If there is no stock journal it will create one.  Previously it created only one for the main company and this
gave an error when updating the module again

addons/stock_account/stock_account_post_install.yml

@@ -3,19 +3,26 @@
 -
   !python {model: account.journal} : |
       #if we already have a coa installed, create journal and set property field
-      company_id = ref('base.main_company')
-      if self.pool.get('res.company').browse(cr, uid, company_id).chart_template_id:
+      company_obj = self.pool['res.company']
+      company_ids = company_obj.search(cr, uid, [('chart_template_id', '!=', False)])
+      for company_id in company_ids:
           from openerp.tools.translate import _
-          journal_id = self.create(cr, uid, {'name': _('Stock Journal'), 'type': 'general', 'code': 'STJ', 'show_on_dashboard': False,})
-          #update property
+
+          #Check if property exists for stock account journal exists
           PropertyObj = self.pool.get('ir.property')
           properties = PropertyObj.search(cr, uid, [('name', '=', 'property_stock_journal'), ('company_id', '=', company_id)])
-          vals = {'name': 'property_stock_journal', 
-            'fields_id': self.pool.get('ir.model.fields').search(cr, uid, [('name', '=', 'property_stock_journal'), ('model', '=', 'product.category'), ('relation', '=', 'account.journal')], limit=1)[0], 
-            'company_id': company_id,
-            'value': 'account.journal,' + str(journal_id)}
-          if properties:
-              PropertyObj.write(cr, uid, properties, vals)
-          else:
-              #create the property
+          AccountJournal = self.pool.get('account.journal')
+
+          #If not, check if you can find a journal that is already there with the same name, otherwise create one
+          if not properties:
+              journal_ids = AccountJournal.search(cr, uid, [('name', '=', _('Stock Journal')), ('company_id', '=', company_id), ('type', '=', 'general')])
+              if journal_ids:
+                journal_id = journal_ids[0]
+              else:
+                journal_id = AccountJournal.create(cr, uid, {'name': _('Stock Journal'), 'type': 'general', 'code': 'STJ', 'company_id': company_id, 'show_on_dashboard': False})
+              vals = {'name': 'property_stock_journal',
+                'fields_id': self.pool.get('ir.model.fields').search(cr, uid, [('name', '=', 'property_stock_journal'), ('model', '=', 'product.category'), ('relation', '=', 'account.journal')], limit=1)[0],
+                'company_id': company_id,
+                'value': 'account.journal,' + str(journal_id)}
+
               PropertyObj.create(cr, uid, vals)