Save errors when not using browse button

[johnscancella]

When submitting an issue please include:

• 2.8.1
• Mac OS

Steps to reproduce

• create new bag
• add some content
• click the "Save Bag As..." button
• type a path in "Save in:" field (DO NOT USE BROWSE BUTTON!)
• click "ok" button

Expected results?

The bag was saved

Actual result?

"Unexpected general bug" error pops up