Summary:
if grammatically incorrect EDC file is opened, then
Undo causes error caution (with red alert) even though
there is no Undo action.
Test Plan:
1. Make incorrect EDC file. (e.g. Write "aaaa" in EDC file incorrectly)
2. Save the wrong EDC file.
3. Newly open the wrong EDC file.
4. press Undo button and it causes error caution.
Reviewers: Hermet, Jaehyun_Cho
Reviewed By: Jaehyun_Cho
Differential Revision: https://phab.enlightenment.org/D4118
f4cf6703bb