Description of problem:

If I move my cursor to the top left and start typing to search for an item gnome-shell crashes. I found a core file that shows shell-app.c:1264 trying to do a strstr on app->casefolded_exec which is NULL.

Version-Release number of selected component (if applicable):

gnome-shell-3.2.1-2.fc16.x86_64

How reproducible:

Always

Steps to Reproduce:
1. Move cursor to top-left
2. Type anything
3. Crash
  
Actual results:

Sad gnome computer screen telling me to restart gnome-shell.

Expected results:

gnome-shell displaying some search icons that relate to what I typed.

Additional info:

There is a core file left behind. Examining it with gdb shows that gnome shell tries to do a strstr on app->casefolded_exec which is NULL leading to the crash.

Reading symbols from /usr/bin/gnome-shell...Reading symbols from /usr/lib/debug/usr/bin/gnome-shell.debug...done.
done.
[New LWP 2389]
[New LWP 2396]
[New LWP 2547]
[New LWP 2537]
[New LWP 2398]
[New LWP 2397]
[New LWP 2395]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/usr/bin/gnome-shell'.
Program terminated with signal 11, Segmentation fault.
#0  __strstr_sse42 (s1=0x0, s2=0x3358e10 "sl") at ../sysdeps/x86_64/multiarch/strstr.c:179
179	  if (__builtin_expect (p1[0] == '\0', 0))
(gdb) up
#1  0x00007f008ad80d75 in _shell_app_match_search_terms (terms=<optimized out>, app=0x279cc60 [ShellApp]) at shell-app.c:1264
1264	      p = strstr (app->casefolded_exec, term);
(gdb) list
1259	            current_match = MATCH_PREFIX;
1260	          else
1261	            current_match = MATCH_SUBSTRING;
1262	        }
1263	
1264	      p = strstr (app->casefolded_exec, term);
1265	      if (p != NULL)
1266	        {
1267	          if (p == app->casefolded_exec || *(p - 1) == '-')
1268	            current_match = MATCH_PREFIX;
(gdb) print *app
$1 = {parent = {g_type_instance = {g_class = 0x2795330}, ref_count = 2, qdata = 0x2fca071}, started_on_workspace = 0, state = SHELL_APP_STATE_STOPPED, entry = 0x2794550, 
  running_state = 0x0, window_id_string = 0x0, casefolded_name = 0x3431a60 "nautilus pastebin configurator", name_collation_key = 
    0x27939a0 "QDXWLOXVSDVWHELQFRQILJXUDWRU\001", '\030' <repeats 28 times>, "\001\020\t\t\t\t\t\t\t\020\t\t\t\t\t\t\t\020", '\t' <repeats 11 times>, "\001\tӑ\tӑ", 
  casefolded_description = 0x0, casefolded_exec = 0x0}