diff --git a/bin/report/interface.py b/bin/report/interface.py
index ec9ed7ddef1..16dfafe0a18 100644
--- a/bin/report/interface.py
+++ b/bin/report/interface.py
@@ -164,6 +164,8 @@ class report_rml(report_int):
 
         def translate(doc, lang):
             for node in doc.xpath('//*[@t]'):
+                if not node.text:
+                    continue
                 translation = ir_translation_obj._get_source(cr, uid, self.name2, 'xsl', lang, node.text)
                 if translation:
                     node.text = translation
diff --git a/bin/report/render/__init__.py b/bin/report/render/__init__.py
index 1a888e18b75..1d0a4464e0b 100644
--- a/bin/report/render/__init__.py
+++ b/bin/report/render/__init__.py
@@ -25,8 +25,9 @@ from render import render
 
 try:
     import Image
-except:
-    print 'WARNING; Python Imaging not installed, you can use only .JPG pictures !'
+except ImportError:
+    import logging
+    logging.getLogger('init').warning('Python Imaging not installed, you can use only .JPG pictures !')
 
 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
 
diff --git a/bin/report/render/rml.py b/bin/report/render/rml.py
index 0bc78f95555..568e83641ea 100644
--- a/bin/report/render/rml.py
+++ b/bin/report/render/rml.py
@@ -29,12 +29,11 @@ import makohtml2html as makohtml
 
 
 class rml(render.render):
-    def __init__(self, rml, localcontext = None, datas={}, path='.', title=None):
-        render.render.__init__(self, datas)
+    def __init__(self, rml, localcontext = None, datas=None, path='.', title=None):
+        render.render.__init__(self, datas, path)
         self.localcontext = localcontext
         self.rml = rml
         self.output_type = 'pdf'
-        self.path = path
         self.title=title
 
 
@@ -42,7 +41,7 @@ class rml(render.render):
         return rml2pdf.parseNode(self.rml, self.localcontext, images=self.bin_datas, path=self.path,title=self.title)
 
 class rml2html(render.render):
-    def __init__(self, rml,localcontext = None, datas = {}):
+    def __init__(self, rml,localcontext = None, datas=None):
         super(rml2html, self).__init__(datas)
         self.rml = rml
         self.localcontext = localcontext
@@ -52,7 +51,7 @@ class rml2html(render.render):
         return htmlizer.parseString(self.rml,self.localcontext)
 
 class rml2txt(render.render):
-    def __init__(self, rml, localcontext= None, datas={}):
+    def __init__(self, rml, localcontext= None, datas=None):
         super(rml2txt, self).__init__(datas)
         self.rml = rml
         self.localcontext = localcontext
@@ -62,7 +61,7 @@ class rml2txt(render.render):
         return txtizer.parseString(self.rml, self.localcontext)
 
 class odt2odt(render.render):
-    def __init__(self, rml, localcontext = None, datas = {}):
+    def __init__(self, rml, localcontext=None, datas=None):
         render.render.__init__(self, datas)
         self.rml_dom = rml
         self.localcontext = localcontext
@@ -72,7 +71,7 @@ class odt2odt(render.render):
         return odt.parseNode(self.rml_dom,self.localcontext)
 
 class html2html(render.render):
-    def __init__(self, rml, localcontext = None, datas = {}):
+    def __init__(self, rml, localcontext=None, datas=None):
         render.render.__init__(self, datas)
         self.rml_dom = rml
         self.localcontext = localcontext
diff --git a/bin/report/render/rml2pdf/trml2pdf.py b/bin/report/render/rml2pdf/trml2pdf.py
index b609528177e..d01317f8257 100644
--- a/bin/report/render/rml2pdf/trml2pdf.py
+++ b/bin/report/render/rml2pdf/trml2pdf.py
@@ -942,8 +942,12 @@ class _rml_template(object):
             fis.append(PageCount())
             self.doc_tmpl.build(fis)
 
-def parseNode(rml, localcontext = {},fout=None, images={}, path='.',title=None):
+def parseNode(rml, localcontext=None,fout=None, images=None, path='.',title=None):
     node = etree.XML(rml)
+    if localcontext is None:
+        localcontext = {}
+    if images is None:
+        images = {}
     r = _rml_doc(node, localcontext, images, path, title=title)
     #try to override some font mappings
     try: