#390 - Staff Appraisal Edit page - Fixed display error of 2nd evaluation...

... officer data not yet exist (SKT Being Formulated).

1) Fixed 'INVALID SLICE SIZE' in weeklytimetable &timetable.
Other related fixes
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a) RSPEC-Fixed illegal nesting - Asset index(partial show last page).
b) Asset - new (translation for category) & revised - assettype (dropdown).
c) RSPEC-temporary fixes - current user - lesson plan.
d) relationship added (timetable_period & weeklytimetable_detail).
e) RSPEC - add validation(presence) - lesson_plan_spec, weeklytimetable_spec & weeklytimetable_detail_spec.