Improve user experience

- replace some of "N/A"s by more specific information
- use 1 instead of "None" as count if count element is missing
- use "N/A" instead of empty fields

Closes #26

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>