Findc allows empty string to be entered without any explanation in UG

[nus-pe-bot]

Steps to Reproduce:

1. Open App
2. Enter findc a/ (empty string) or findc n/ (empty string) etc. (excluding findc t/, which displays an appropriate error)
3. The app displays all contacts in the list that at least have SOME data in the corresponding field, which is not explained in the UG

Expected Behavior: Eithe the UG explains that you may find all "existent" fields when you enter an empty string after an findc command (excluding t/) OR it should display an error

Actual Behavior: The app displays all contacts in the list that at least have SOME data in the corresponding field

• Can be considered as FunctionalityBug or DocumentationBug

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_{[original: nus-cs2103-AY2021S1/pe-interim#6024]}

[jazerler]

Team's Response

No response provided.

Duplicate status (if any):

Duplicate of #6017