guard against missing range

Change-Id: Icdb0694b9c1771a475368aeeb4cb11f4ba8b84f3

lotuswordpro/source/filter/lwptablelayout.cxx

@@ -1122,10 +1122,17 @@ void LwpTableLayout::PutCellVals(LwpFoundry* pFoundry, LwpObjectID aTableID)
             pTableRange = pTableRange->GetNext();
         }
 
-        if (pTableRange)
-        {
+        if (!pTableRange)
+            return;
+
         LwpCellRange* pRange = static_cast<LwpCellRange*>(pTableRange->GetCellRangeID().obj().get());
+        if (!pRange)
+            return;
+
         LwpFolder* pFolder = static_cast<LwpFolder*>(pRange->GetFolderID().obj().get());
+        if (!pFolder)
+            return;
+
         LwpObjectID aRowListID = pFolder->GetChildHeadID();
         LwpRowList* pRowList = static_cast<LwpRowList*>(aRowListID.obj().get());
 
@@ -1160,7 +1167,6 @@ void LwpTableLayout::PutCellVals(LwpFoundry* pFoundry, LwpObjectID aTableID)
             }
             pRowList = static_cast<LwpRowList*>(pRowList->GetNextID().obj().get());
         }
-        }
 
     }catch (...) {
         assert(false);