Files crashes if a paste operation is cancelled.

[Jeremy Wootten]

(Freya 64-bit) If you paste a file into a folder that either has insufficient space or already has a file of the same name and choose "Cancel" from the dialog, Files crashes.

backtrace:

Program received signal SIGSEGV, Segmentation fault.
__lambda121_ (_data29_=0xa39440) at /media/jeremy/Shared/shared_data/Vala/Elementary/pantheon-files-branches/Loki/pantheon-files/src/View/AbstractDirectoryView.vala:1122
1122 view.select_glib_files (pasted_files_list, pasted_files_list.first ().data);
(gdb) bt
#0 __lambda121_ (_data29_=0xa39440) at /media/jeremy/Shared/shared_data/Vala/Elementary/pantheon-files-branches/Loki/pantheon-files/src/View/AbstractDirectoryView.vala:1122
#1 ___lambda121__gsource_func (self=0xa39440) at AbstractDirectoryView.c:6131
#2 0x00007ffff523fab5 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007ffff523fe18 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007ffff523febc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5 0x00007ffff5a5644c in g_application_run () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#6 0x00007ffff76fd5e0 in granite_application_run () from /usr/lib/x86_64-linux-gnu/libgranite.so.2
#7 0x0000000000438110 in _vala_main (args=0x7fffffffdea8, args_length1=2)
    at /media/jeremy/Shared/shared_data/Vala/Elementary/pantheon-files-branches/Loki/pantheon-files/src/main.vala:30
#8 0x00007ffff4994ec5 in __libc_start_main (main=0x427e20 <main>, argc=2, argv=0x7fffffffdea8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>,
    stack_end=0x7fffffffde98) at libc-start.c:287
#9 0x0000000000427e55 in _start ()