src/__init__.py: fixed call to mupdf.fz_new_image_from_compressed_buf…

…fer2().

Underlying MuPDF C++ fn now takes references to std::vectors, so we need to
pass empty vectors intead of None.

src/__init__.py

@@ -7819,8 +7819,8 @@ def _insert_image(self,
                         yres,
                         1,  # interpolate
                         0,  # imagemask,
-                        None,   # decode
-                        None,   # colorkey
+                        list(), # decode
+                        list(), # colorkey
                         cbuf1,
                         mask,
                         )