Added a hint in the popup if no channel has yet been visited

[NikkelM]

Closes #299

[coveralls]

Pull Request Test Coverage Report for Build 9684221874

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.838%

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Totals
Change from base Build 9683958924:	0.0%
Covered Lines:	1401
Relevant Lines:	1493

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💛 - Coveralls