Raised exception in the __del__ Picobase method

[elechapt]

The Picoscope object raise an exception if it can't be opened (which is fine), but if catched, another one is raised straight after at the garbage collector deletion, from _lowLevelCloseUnit in the Picobase.close() method, and generate an Exception ignored message, which is annoying when printing other informative messages about an emulated one taking over. Can the OSError be catched in the close() method ? That's not much of a big issue, but just wanted to mention it.

[hmaarrfk]

Interesting. Clean __del__ methods are hard to do. A PR would be welcome!

[elechapt]

Hi there, the close() method also rise a AttributeError exception when the self.handle attribute is not found, which happens when the picoscope is not connected and we "delete" the object (by assigning the variable to another object for example). I'll clean the method.