Entering blank input has no error message

[yingx9]

Steps to reproduce

1. Choose a color b
2. Choose a difficulty level 1
3. Enter blank input

Expected
Error message saying its an invalid command

Actual
Nothing happens or is printed

[soc-se-bot]

Team's Response

Not applicable since after selecting difficulty, the board and a list of commands to use will be shown.
You can use show command to show the current board and help command after game starts for any assistance

Items for the Tester to Verify

❓ Issue response

Team chose [response.Rejected]

• I disagree

Reason for disagreement: Invalid user input should still be handled (like showing an error message) since the user can accidentally enter a blank input at any point in time, not just in this scenario.

---