Listing firewalls with no rules doesn't display relevant information

[fernando-villalba]

Issue

Listing firewalls with no rules doesn't display helpful or relevant information

1. Create a firewall without rules

civo fw create test-issue --create-rules=false 

2. List the firewall without rules

civo firewall rule ls test-issue 

Output:

Acceptance Criteria

The output provided above is not helpful. Instead, the message should be something like:

Firewall test-issue has no rules, to create rules use command civo firewall rule create, for example:
civo firewall rule create test-issue -c '0.0.0.0/0' -s 443 -e 443 -l HTTPS

Or something like that

[Praveen005]

Hi Team,

for this issue, adding a check to see if firewallRules slice is empty and erroring out with the above suggested message would be okay I believe.

Result: