[PE-D][Tester A] No way to check categories made

[nus-se-script]

A improvement feature that I think can be done is a way to check what categories has been made. When there is no expenses tagged to a category, there is no way to see the category made in both view-budget and view-expenses.

Hence, it is easy to forget and miss out what categories I have made.

Steps to recreate:

• add a cateogory without tagging it to an expense

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Labels: type.FeatureFlaw severity.Low original: Bev-low/ped#12

[glenda-1506]

add into view-expense. whereby the category without expenses would just print "No expense" add view-category command