small bug in bounding_rect

[PiMaV]

Got his while playing with an image:

Traceback (most recent call last): File "C:\PYTHON\BLITZ\blitz\layout\widgets.py", line 195, in update_bounding_rect left = min([p[1].x() for p in pos]) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ValueError: min() arg is an empty sequence

[irkri]

This is fixed, we now check if the sequence in question is empty before taking min or max.

[PiMaV]

thus done