Created attachment 3254 [details]
snapshot of a task table with 0 columns

DESCRIPTION:

When clicking on the Edit Columns button from both Tasks and Recipes tables, I can deselect all the fields leaving the table with 0 columns. Or better said eliminating the table. 

BUILD: 2.2_M1.rc2: 6f0c5537e02c59e1c8f3b08f598dc049ff8ee098
ENVIRONMENT: Debian 4.3.0-0.bpo.1-amd64
STEPS TO REPRODUCE: 
 
 
1. Start with a default Yocto project (qemux86), start the Toaster, and build "bitbake core-image-minimal". 
 
2. In Toaster, select the build, and select the "Tasks" link in the left sidebar 

3. Columns 
 

  * Observe that the default columns are:  
   
    "Order, Recipe, Task, Executed, Outcome, Cache attempt" 
 
  * Click the "Edit Columns" button. 
   
  * Observe that the fields are sorted as follows (with the indicated items greyed) 
 
    [ ] CPU usage 
    [x] Cache attempt 
    [ ] Disk I/O (ms) 
    [x] Executed 
    [x] Order            {greyed} 
    [x] Outcome 
    [x] Recipe           {greyed} 
    [ ] Recipe version 
    [x] Task             {greyed} 
    [ ] Time (secs)  
 
  * For each of the greyed items, attempt to click them. Observe that they do not change. 
 
  * For each of the non-greyed items, attempt to click them. Observe that the respective column dynamically appears when checked and disappears when un-checked. 
 
 
4. Check the Recipe table and  see that you can deselect all columns.
 

 
EXPECTED OUTCOME:

In the past the fields marked as gray could not be unselected therefore the table would always have columns.