Fields can take empty/blank string without warnings

[nus-pe-bot]

"findc n/" or "findc n/(empty space)" can both run without warnings. And the empty spaces seem not counted into name matching as it shows all persons.

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_{[original: nus-cs2103-AY2021S1/pe-interim#6010]}

[zhxchd]

Team's Response

If no name is provided, it is expected that all names matches.

This is similar to using an empty search term in the CATCHER interface.

Duplicate status (if any):

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