Bug: missing _alpha.jpg-file can cause crashes

[rubberduck]

i found out, that supertuxkart often crashes(not always), when i want to go back from a track to the menu, if this track uses a _alpha.jpg-file, when stk can't find it

i had this problem in my object-collection, i added a plant from hacienda with this texture: palmtree3.jpg, it also uses palmtree3_alpha.jpg
normally i don't copy _alpha.jpg files into the folder,
because they are in stk-texture-folder, but this isn't in stk-texture-folder
i always had this crashes with this added object, then i added palmtree3_alpha.jpg to the object-collection-folder and it works now

[hiker]

i always had this crashes with this added object, then i added palmtree3_alpha.jpg to the object-collection-folder and it works now

Ticket time

Thanks!
Joerg

[rubberduck]

it's here:

https://sourceforge.net/apps/trac/super ... icket/1003