add leading space to return value of Input.addatts for backward-compa…

…tibility (tx Martin Borgert)

web/form.py

@@ -164,7 +164,8 @@ def rendernote(self, note):
         else: return ""
 
     def addatts(self):
-        return str(self.attrs)
+        # add leading space for backward-compatibility
+        return " " + str(self.attrs)
 
 class AttributeList(dict):
     """List of atributes of input.