View command does not handle faulty inputs

[ryanchua00]

When view is entered with:

1. no additional parameter, view
2. non-integer parameter, view abc

No alert message is displayed.

I would expect a error message stating that an index is required. For example, something similar to the below delete command error message.

[nus-se-bot]

Team's Response

Severity should be medium instead since it does not affect the functionality of the view function, but lowers the user's experience of viewing contact details.

The 'Original' Bug

[The team marked this bug as a duplicate of the following bug]

View command has no error message on faulty inputs

When view is entered with no additional parameter, no alert message is displayed.

I would expect a error message stating that an index is required. For example, something similar to the below delete command error message.

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_{[original: nus-cs2103-AY2223S2/pe-interim#2182] [original labels: type.FunctionalityBug severity.Medium]}

Their Response to the 'Original' Bug

[This is the team's response to the above 'original' bug]

Confirmed, that an error message should be displayed in this scenario.

Items for the Tester to Verify

:question: Issue duplicate status

Team chose to mark this issue as a duplicate of another issue (as explained in the Team's response above)

• [ ] I disagree

Reason for disagreement: [replace this with your explanation]

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## :question: Issue severity Team chose [`severity.Low`] Originally [`severity.High`] - [x] I disagree **Reason for disagreement:** The team acknowledges that this should be a `severity.Medium` bug. See image below. Additionally, I would like to merge issue#2 with this issue for a single `severity.Medium` bug. 

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