configurator: fix some BusinessConfiguration methods

BusinessConfiguration have a resource category, but it's the workflow,
it's not really a resource, so some APIs from the base Amount class are
not available. Because they have no meaning on BusinessConfiguration
anyway, define the broken APIs to return nothing.

This fixes errors trying to use check_consistency alarm on Business
Configurations.

bt5/erp5_configurator/DocumentTemplateItem/portal_components/document.erp5.BusinessConfiguration.py

@@ -574,3 +574,24 @@ class BusinessConfiguration(Item):
 
     if self.portal_workflow.isTransitionPossible(self, 'install'):
       self.activate(after_tag=kw["tag"]).install()
+
+  # Business Configuration are Item, which inherits from Amount and expect the
+  # resource category document to be an actual resource, but in the case of
+  # Business Configuration it is a Workflow.
+  security.declareProtected(Permissions.AccessContentsInformation, 'getPrice')
+  def getPrice(self, *args, **kw):
+    """Business Configuration have no price
+    """
+    return None
+
+  security.declareProtected(Permissions.AccessContentsInformation, 'getBaseUnitPrice')
+  def getBaseUnitPrice(self, *args, **kw):
+    """Business Configuration have no base unit price
+    """
+    return None
+
+  security.declareProtected(Permissions.AccessContentsInformation, 'getVariationBaseCategoryList')
+  def getVariationBaseCategoryList(self, *args, **kw):
+    """Business Configuration have no variation base category list
+    """
+    return []