[Checkins] SVN: z3c.rml/trunk/src/z3c/rml/flowable.py Improve condition check. Use recommended way and check for None.

[Roger Ineichen]

Log message for revision 84838:
  Improve condition check. Use recommended way and check for None.
  I've go the following Warning in my tests with Report Lab Version:
  RELEASE 2.1  at 15:00 GMT  24/May/2007
  
  raise Exception("Subprocess error: %s" % error)
  Exception: Subprocess error: ...\rml\flowable.py:863: 
  FutureWarning: The behavior of this method will change in future versions. 
  Use specific 'len(elem)' or 'elem is not None' test instead.

Changed:
  U   z3c.rml/trunk/src/z3c/rml/flowable.py

-=-
Modified: z3c.rml/trunk/src/z3c/rml/flowable.py
===================================================================
--- z3c.rml/trunk/src/z3c/rml/flowable.py	2008-03-21 09:37:15 UTC (rev 84837)
+++ z3c.rml/trunk/src/z3c/rml/flowable.py	2008-03-21 12:32:58 UTC (rev 84838)
@@ -860,14 +860,14 @@
         # Get the header
         ptoHeader = self.element.find('pto_header')
         header = None
-        if ptoHeader:
+        if ptoHeader is not None:
             header = Flow(ptoHeader, self.parent)
             header.process()
             header = header.flow
         # Get the trailer
         ptoTrailer = self.element.find('pto_trailer')
         trailer = None
-        if ptoTrailer:
+        if ptoTrailer is not None:
             trailer = Flow(ptoTrailer, self.parent)
             trailer.process()
             trailer = trailer.flow