Commonise duplicated assertion in CliMenu.

[thehereward]

No description provided.

[AydinHassan]

Hi, thanks! This failed the CS checks as underscored methods are not allowed! I can make this change later if you don't have time? You can ignore the appveyor build failure. I will be removing that from PR's soon.

[thehereward]

No problem, I can take the underscores out now - old habits die hard!

[codecov-io]

Current coverage is 55.39%

Merging #26 into master will not affect coverage as of 4a33efb

@@            master     #26   diff @@
======================================
  Files           15      15       
  Stmts          630     630       
  Branches         0       0       
  Methods        138     139     +1
======================================
  Hit            349     349       
  Partial          0       0       
  Missed         281     281       

Review entire Coverage Diff as of 4a33efb

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[AydinHassan]

Thanks!

[AydinHassan]

I'll get to the other tomorrow, just about to fly 😊