Fix crash in profiling when no directory name found

Author: yanjost

debug_toolbar/panels/profiling.py

@@ -76,7 +76,11 @@ def func_std_string(self):  # match what old profile produced
             if idx > -1:
                 file_name = file_name[(idx + 14):]
 
-            file_path, file_name = file_name.rsplit(os.sep, 1)
+            split_path = file_name.rsplit(os.sep, 1)                
+            if len(split_path) > 1:
+                file_path, file_name = file_name.rsplit(os.sep, 1)
+            else:
+                file_path = '<module>'
 
             return format_html(
                 '<span class="djdt-path">{0}/</span>'