Description of problem:
Tig crashes when trying to stage a chunk.

Version-Release number of selected component (if applicable):
$ rpm -qa tig
tig-2.0.3-1.fc21.x86_64

How reproducible:
Everytime

Steps to Reproduce:
1. open tig
2. go to Unstaged changes
3. press d
4. navigate to some chunk
5. press u

Actual results:
tig crashes

Additional info:

Core was generated by `tig'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  view_no_refresh (view=view@entry=0x0, flags=flags@entry=OPEN_REFRESH) at src/view.c:559
559                    ((flags & OPEN_REFRESH) && !view_can_refresh(view));
(gdb) bt full
#0  view_no_refresh (view=view@entry=0x0, flags=flags@entry=OPEN_REFRESH) at src/view.c:559
No locals.
#1  0x00000000004155b8 in load_view (view=0x0, prev=prev@entry=0x0, flags=flags@entry=OPEN_REFRESH) at src/view.c:770
        refresh = <optimized out>
#2  0x000000000041f30d in stage_request (view=0x63bb40 <stage_view>, request=<optimized out>, line=<optimized out>) at src/stage.c:442
No locals.
#3  0x000000000040340c in view_driver (request=REQ_STATUS_UPDATE, view=0x63bb40 <stage_view>) at src/tig.c:206
        i = <optimized out>
#4  main (argc=<optimized out>, argv=<optimized out>) at src/tig.c:697
        codeset = <optimized out>
        pager_mode = false
        request = <optimized out>
        view = <optimized out>