Only pop warning when module path not found

[davidlatwe]

Problem

I have some loader plugins that is only for me to diagnose the pipeline health or testing, like printing representation ID. But those plugins are in a place that only I can have access, which will raise error to others when the Avalon is registering plugin path that could not be found.

Solution

Instead of raising error, just pop up warning.

[mottosso]

That makes sense.. wonder why it hasn't been a problem until now. It should act like PYTHONPATH, and it also ignores things like this.

Free to merge!

[davidlatwe]

Merge !