[lmi] Unexpected alert while directly editing a census

[Murphy, Kimberly]

While testing revision 5334, I encountered an alert that I 
did not expect. 

Consider:

File | New | Census
  Census | Add cell
  Census | Edit cell | change the Individual payment | OK
File | Save

Directly click on one cell's Payment with the intention to edit. 
While the field's in edit mode and the [...] visible, close the 
census [X].

The following message is observed:

---------------------------
wxWidgets Debug Alert
---------------------------
../src/common/wincmn.cpp(468): assert "GetEventHandler() == this" failed

in ~wxWindowBase(): any pushed event handlers must have been removed
Do you want to stop the program?
You can also choose [Cancel] to suppress further warnings.
---------------------------
Yes   No   Cancel
---------------------------

Click Yes, receive the following:

---------------------------
lmi: lmi_wx_shared.exe - Application Error
---------------------------
The exception Breakpoint A breakpoint has been reached.  (0x80000003) 
occurred in the application at location 0x7c90120e. 
Click on OK to terminate the program
Click on CANCEL to debug the program
---------------------------
OK   Cancel   
---------------------------

This may not be behavior users would execute often. However, 
it is one way to cancel any changes and start over.  

The alert was not observed following the steps with a new 
"unsaved" census; in this case, the usual message appeared
when closing the census:

---------------------------
lmi...
---------------------------
Do you want to save changes to unnamed1?
---------------------------
Yes   No   Cancel   
--------------------------- 



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