ID 411865 - Importing into a channel from a folder whose name has a @ sign, raises an Import Failure error

Problem summary
Importing into a channel from a folder whose name has @ in the name, raises an Import Failure error

Customer reported version
mari.4.5v2

Customer reported platform
n_a_linux

Steps to reproduce

1) Create a folder, name it testing@foundry and add an image to it

2) Open Mari and an example project

3) Go to Channels>Right Click on a channel>Import>Import into Current Channel

4) Choose the folder created in step 1 and import the texture

result: Mari raises an Import Failure error

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Expected behaviour
Mari should import the textures regardless of the folder's name 

Actual behaviour
Mari raises an error if the name of the folder contains a @

Workaround
Avoid having the @ between letters in the folders name. Mari imports the textures if the @ sign is in the beginning or the end of the folders name but not in-between letters

Reproduced by support
This bug has been reproduced in:
4.5v2 - Windows 10 - CentOS 7 

2.6v5 - Windows 10 - CentOS 7 

Earliest version tested
2.6v5 - This issue appears to be in all versions of the product