add boolean parameter check_dependencies to preinstall

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@12014 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/BusinessTemplate.py

@@ -3925,12 +3925,16 @@ Business Template is a set of definitions, such as skins, portal types and categ
       """
       return self.portal_templates.update(self)
 
-    def preinstall(self, **kw):
+    def preinstall(self, check_dependencies=1, **kw):
       """
         Return the list of modified/new/removed object between a Business Template
         and the one installed if exists
       """
 
+      if check_dependencies:
+        # required because in multi installation, dependencies has already
+        # been checked before and it will failed here as dependencies can be
+        # installed at the same time
         self.checkDependencies()
 
       modified_object_list = {}