Inconsistency in handling error for command

[BernardLesley]

Describe the bug

Error is inconsistent for different invalid commands (particularly if the invalid command contains space)

To Reproduce

Steps to reproduce the behavior:

1. enter foo bar
2. enter foo

Expected behavior

The same error message should be thrown

Screenshots

[soc-pe-bot]

Team's Response

Although error message is different, it does not affect the operation of the product, does not cause any inconveniences to the user, and does not affect the usage of our program. At its worst, this should be only a cosmetic problem which should be given severity.VeryLow instead of severity.Low.

Items for the Tester to Verify

:question: Issue response

Team chose [response.Rejected]

• [x] I disagree

Reason for disagreement: I agree that the severity should be lowered to very low, however, this inconsistency still causes confusion and minor inconvenience to the potential user, therefore I believe the bug should be accepted with severity.VeryLow

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## :question: Issue severity Team chose [`severity.VeryLow`] Originally [`severity.Low`] - [ ] I disagree **Reason for disagreement:** [replace this with your explanation]

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