[Label] setting label 'move on completed' may fail with web ui

[mathroc]

when trying to set a 'move on completed' folder on a new label with the web ui, if I do :

• right clic on label
• label options
• location
• check 'apply location settings'
• check 'move completed to'
• enter folder location
• OK

the dialog box does not close and the label is not updated, instead I have to :

• right clic on label
• label options
• location
• check 'apply location settings'
• OK
• right clic on label
• label options
• location
• check 'move completed to'
• enter folder location
• OK

and now the label is updated

[bobbyrward]

This is caused by the auto_add_trackers being empty. If it's empty, it's an array with 0 items for whatever reason.

 https://github.com/bobbyrward/deluge/commit/0522274f5c40bf8f39b5fcac1512817535d7b78d

[Cas]

Fixed 1.3-stable:  a35937454