src/__init__.py: fix call of pdf_is_ocg_hidden() with mupdf master.

Author: julian-smith-artifex-com

src/__init__.py

@@ -4935,7 +4935,11 @@ def get_ocgs(self):
                         o = mupdf.pdf_array_get( intent, j)
                         if mupdf.pdf_is_name( o):
                             intents.append( mupdf.pdf_to_name( o))
-            hidden = mupdf.pdf_is_ocg_hidden( pdf, mupdf.PdfObj(), usage, ocg)
+            if mupdf_version_tuple >= (1, 27):
+                resource_stack = mupdf.PdfResourceStack()
+                hidden = mupdf.pdf_is_ocg_hidden( pdf, resource_stack, usage, ocg)
+            else:
+                hidden = mupdf.pdf_is_ocg_hidden( pdf, mupdf.PdfObj(), usage, ocg)
             item = {
                     "name": name,
                     "intent": intents,