Fetch defaults in purchase common and sales common related doctypes and fix minor utf-8 issues

erpnext/utilities/doctype/bulk_rename_tool/bulk_rename_tool.py

@@ -76,7 +76,8 @@ class DocType:
 		from webnotes.utils import file_manager
 		fn, content = file_manager.get_file(fid)
 		
-		if not type(content) == str:
+		# NOTE: Don't know why this condition exists
+		if not isinstance(content, basestring) and hasattr(content, 'tostring'):
 		  content = content.tostring()
 
 		return content