ZODB Components: Fix pylint warning.

W: Dangerous default value _MARKER (__builtin__.list) as argument (dangerous-default-value)

bt5/erp5_base/DocumentTemplateItem/portal_components/document.erp5.Image.py

@@ -173,7 +173,7 @@ class Image(TextConvertableMixin, File, OFSImage):
     return self.height
 
   security.declareProtected(Permissions.AccessContentsInformation, 'getContentType')
-  def getContentType(  # pylint: disable=arguments-differ,dangerous-default-value
+  def getContentType(  # pylint: disable=arguments-differ
       self,
       default=_MARKER,
     ):
@@ -211,7 +211,7 @@ class Image(TextConvertableMixin, File, OFSImage):
     return links
 
   security.declareProtected(Permissions.AccessContentsInformation, 'displayMap')
-  def displayMap(  # pylint: disable=dangerous-default-value
+  def displayMap(
       self,
       exclude=None,
       format=None,  # pylint: disable=redefined-builtin
@@ -414,7 +414,7 @@ class Image(TextConvertableMixin, File, OFSImage):
       return self.getData()
     return self._resize(quality, width, height, format, resolution, frame, crop)
 
-  def _makeDisplayPhoto(  # pylint: disable=dangerous-default-value
+  def _makeDisplayPhoto(
       self,
       format=None,  # pylint: disable=redefined-builtin
       quality=_MARKER,

product/ERP5/Document/Document.py

@@ -52,7 +52,7 @@ from Products.ERP5.mixin.crawlable import CrawlableMixin
 from Products.ERP5.mixin.discoverable import DiscoverableMixin
 from Products.ERP5.mixin.url import UrlMixin
 
-_MARKER = []
+_MARKER = object()
 
 # these property ids are unchangable
 FIXED_PROPERTY_IDS = ('id', 'uid', 'rid', 'sid')

product/ERP5/bootstrap/erp5_core/DocumentTemplateItem/portal_components/document.erp5.EmailDocument.py

@@ -52,7 +52,7 @@ from email.utils import parsedate_tz, mktime_tz
 
 DEFAULT_TEXT_FORMAT = 'text/html'
 COMMASPACE = ', '
-_MARKER = ()
+_MARKER = object()
 
 filename_regexp = 'name="([^"]*)"'
 

product/ERP5/bootstrap/erp5_core/DocumentTemplateItem/portal_components/document.erp5.MailMessage.py

@@ -33,7 +33,7 @@ from Products.ERP5Type import Permissions, PropertySheet
 
 from erp5.component.document.Event import Event
 
-_MARKER = ()
+_MARKER = object()
 
 class MailMessage(Event):
   """

product/ERP5/bootstrap/erp5_core/ToolComponentTemplateItem/portal_components/tool.erp5.DomainTool.py

@@ -34,7 +34,7 @@ from Products.ERP5Type import Permissions
 from Products.ERP5Type.Tool.BaseTool import BaseTool
 from Products.ZSQLCatalog.SQLCatalog import SimpleQuery, ComplexQuery
 
-_MARKER = ()
+_MARKER = object()
 
 class DomainTool(BaseTool):
   """

product/ERP5/bootstrap/erp5_core/ToolComponentTemplateItem/portal_components/tool.erp5.IntrospectionTool.py

@@ -44,7 +44,7 @@ from cgi import escape
 
 import logging
 
-_MARKER = ()
+_MARKER = object()
 
 event_log = logging.getLogger()
 access_log = logging.getLogger("access")