ROB: Handle recursion error (#804)

This doesn't solve the issue, but it might make it less severe.

See #520
See #268
See virantha/pypdfocr#59

sfneal@3558a69

Co-authored-by: danniesim <geemee@gmail.com>

PyPDF2/pdf.py

@@ -634,7 +634,7 @@ def _sweepIndirectReferences(self, externMap, data):
                         newobj = self._sweepIndirectReferences(externMap, newobj)
                         self._objects[idnum-1] = newobj
                         return newobj_ido
-                    except ValueError:
+                    except (ValueError, RecursionError):
                         # Unable to resolve the Object, returning NullObject instead.
                         warnings.warn("Unable to resolve [{}: {}], returning NullObject instead".format(
                             data.__class__.__name__, data