DISPIO: sys.print_exception causes boot loop in displayio

this causes a boot loop:
```
for i in range(10):
    print('trying this height', )
    try:
        shp = Shape(100,i)
        for j in range(1,i):
            print(j)
            shp.set_boundary(j,0,100-j)
    except Exception as e:
        sys.print_exception(e)
    time.sleep(1)
```