invalid filename exception could be more specific

[nus-se-script]

The command results only specify: Filenames should be alphanumeric and .json or .csv files. Example: 'myContacts.json' or 'myContacts2.csv'

It might be better by stating Filenames should be alphanumeric, should not contain spaces, and .json or .csv files. Example: 'myContacts.json' or 'myContacts2.csv'

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_{[original: nus-cs2103-AY2324S2/pe-interim#5387] [original labels: severity.Low type.FeatureFlaw]}

[wilsonwid]

Team's Response

We reject this bug. The reasons are as follows:

• This is not a bug as its requirement of being alphanumeric implies that there should not be spaces.

Duplicate status (if any):

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