Adds an extra check to see if __code__ is present. As mentioned in PYSIDE-1755, Mocks are callable objects without __code__ attribute, unlike Python Method or Functions. However, a Mock also has im_func__ and im__self attributes. We made the assumption __code__ would be present if im_func and im_self are present, and this makes it fall under the category of a compiled method. This patch makes an extra check to see if __code__ is present. If it is not, then the Slot (here Mock) is considered as a callable method. Task-number: PYSIDE-1755 Pick-to: 6.2 Change-Id: If7e8f52dfb2409cd856eec0d0b41891d751d8a69 Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>