diff --git a/gestion/darcs_send_changes.py b/gestion/darcs_send_changes.py
index 18784e9d..6c0464bc 100755
--- a/gestion/darcs_send_changes.py
+++ b/gestion/darcs_send_changes.py
@@ -65,8 +65,12 @@ def darcs(args):
 
 def get_patch_properties(hash):
     """ Récupère les informations a propos d'un certain patch. """
-    prop = etree.XML(darcs("changes --match='hash %s' --xml-output" % hash))[0]
-    diff = darcs("diff --match='hash %s' --unified" % hash)
+    if hash:
+        match_cmd = "--match='hash %s'" % hash
+    else:
+        match_cmd = "--last 1"
+    prop = etree.XML(darcs("changes %s --xml-output" % match_cmd))[0]
+    diff = darcs("diff %s --unified" % match_cmd)
     diff = diff[diff.find('\ndiff ')+1:]
     cwd = os.getcwd()
     return { 'author': prop.attrib['author'],
@@ -77,7 +81,7 @@ def get_patch_properties(hash):
              'name': prop.findtext('name'),
              'comment': prop.findtext('comment'),
              'diff': diff,
-             'changes': darcs("changes --match='hash %s' --summary" % hash) }
+             'changes': darcs("changes %s --summary" % match_cmd) }
 
 def get_patches_properties(from_hash):
     """ Construit la liste des informations sur les patches à partir du patch from_hash. """
@@ -134,7 +138,7 @@ contenir les variables suivantes:
     texte = MIMEText(message_template % patch_props, "UTF-8")
     texte.set_charset("UTF-8")
     mail.attach(texte)
-    
+
     patch = MIMEText(diff_template % patch_props, "UTF-8")
     patch.set_type('text/x-patch')
     patch.set_charset("UTF-8")
@@ -202,14 +206,14 @@ if __name__ == "__main__":
         if not os.path.exists('_darcs') and os.getcwd() == '/':
             cprint("Pas de dépôt darcs trouvé")
             sys.exit(1)
-    
+
     if not from_hash:
         if os.path.exists(LAST_SEEN_FILE):
             f = open(LAST_SEEN_FILE)
             from_hash = f.read().strip()
             f.close()
         else:
-            from_hash = ""
+            from_hash = None
 
     patches = get_patches_properties(from_hash)
     if len(patches) == 0: