added modulenotfounderror

mdcomp.py

@@ -28,7 +28,7 @@ try:
     def convert_text(input_text):
         return pypandoc.convert_text(input_text, "html", format="md")
 
-except OSError:
+except (OSError, ModuleNotFoundError) as e:
     print("Pandoc not found on your system. Using mistune (python-only)")
     import mistune