Make sure asset calculation methods returns 0 rather than None

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@5839 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Movement.py

@@ -311,10 +311,9 @@ class Movement(XMLObject, Amount):
     """
     result = self.getSourceInventoriatedTotalAssetPrice()
     if result is not None :
-      if result < 0:
-        return 0.0
-      else :
+      if result > 0:
         return result
+    return 0.0
 
   security.declareProtected( Permissions.AccessContentsInformation,
                              'getSourceInventoriatedTotalAssetCredit')
@@ -326,7 +325,6 @@ class Movement(XMLObject, Amount):
     if result is not None :
       if result < 0:
         return -result
-      else :
     return 0.0
 
   security.declareProtected( Permissions.AccessContentsInformation,
@@ -357,10 +355,9 @@ class Movement(XMLObject, Amount):
     """
     result = self.getDestinationInventoriatedTotalAssetPrice()
     if result is not None :
-      if result < 0:
-        return 0.0
-      else :
+      if result > 0:
         return result
+    return 0.0
 
   security.declareProtected( Permissions.AccessContentsInformation,
                              'getDestinationInventoriatedTotalAssetCredit')
@@ -372,7 +369,6 @@ class Movement(XMLObject, Amount):
     if result is not None :
       if result < 0:
         return -result
-      else :
     return 0.0
 
   security.declareProtected( Permissions.AccessContentsInformation,