[BUG] core-pygui observer widget raises exception if mouse passes over switch nodes

[siliconja]

Describe the bug
If you have an Observer Widget active and move the mouse over a switch node, an exception dialog pops up "node class(SwitchNode) is not expected(CoreNode)".

To Reproduce
See description.

Expected behavior
Observer Widgets should not generate node commands for non-container nodes like switches, hubs, RJ45s, WLANs.

Nothing should happen when I mouse over these other node types.

Screenshots

Desktop (please complete the following information):

• OS: Ubuntu 18.04
• CORE Version develop 2020-07-07

Additional context

[bharnden]

Thanks will check this out, probably applies to other nodes as well, will fix.

[bharnden]

fixed on develop