Malformed Py5Shape objects if Processing's loadShape() returns null

[hx2A]

py5 encountered an error in your code:

File "/home/villares/GitHub/sketch-a-day/2023/sketch_2023_09_23/sketch_2023_09_23.py", line 40, in draw
    24   def draw():
 (...)
    36           elif isinstance(thumb, py5.Py5Image):
    37               rw = thumb.width
    38               func = py5.image
    39           elif isinstance(thumb, py5.Py5Shape):
--> 40               w, h = thumb.get_width(), thumb.get_height()
    41               ratio = w / h
    ..................................................
     w = 64.0
     h = 64.0
    ..................................................

AttributeError: 'NoneType' object has no attribute 'getWidth'

Originally posted by @villares in #352 (comment)

Somehow thumb._instance was None. The _load_py5shape decorator should check for this.