Crash when using Item Browser

[kurisubrooks]

Traceback (most recent call last):
  File "build\gui\itembrowser.py", line 159, in update_item_view
  File "build\assets\items.py", line 141, in get_item_icon
AttributeError: 'list' object has no attribute 'split'

Traceback (most recent call last):
  File "build\gui\itembrowser.py", line 159, in update_item_view
  File "build\assets\items.py", line 137, in get_item_icon
TypeError: argument of type 'NoneType' is not iterable

[rubellyte]

Fixed by a1b048d