minor enhancement for dumping 'None' values (proper way should be empty string because None is too pythonic)

lib/core/dump.py

@@ -414,6 +414,9 @@ class Dump:
                     if len(info["values"]) <= i:
                         continue
 
+                    if info["values"][i] is None:
+                        value = u''
+                    else:
                         value = getUnicode(info["values"][i])
 
                         if re.search("^[\ *]*$", value):