Fix error logging in kudo-cli test

[harryge00]

What this PR does / why we need it:

Original code:

		if err != nil {
			if !strings.Contains(err.Error(), tt.errMessageContains) {
				t.Errorf("%s: expected error '%s' but got '%v'", tt.name, tt.errMessageContains, err)
			}
		} else if tt.errMessageContains != "" {  
			t.Errorf("%s: expected no error but got %v", tt.name, err)

Here err is nil but tt.errMessageContains is not nil. So the error logging should be fixed

[nfnt]

🚢