Do not print an empty table when every addon is up to date

[refaim]

Without -v the status table only receives addons that need attention, so when everything is up to date the command printed a table frame containing nothing but headers, followed by the summary line.

Before:

+---------+----------+---------------+----------------+
| addon   | status   | released_at   | installed_at   |
|---------+----------+---------------+----------------|
+---------+----------+---------------+----------------+
3 addons are up to date

After:

3 addons are up to date

The empty frame carries no information and reads as "nothing is tracked". That is not hypothetical — the reporter in #52 hit exactly this after his addons updated cleanly and filed it as DBM having disappeared from status.

Output is unchanged whenever the table has rows, and the summary keeps its other qualifier:

+-----------------+-----------+---------------+----------------+
| addon           | status    | released_at   | installed_at   |
|-----------------+-----------+---------------+----------------|
| SomeRandomAddon | untracked |               |                |
+-----------------+-----------+---------------+----------------+
3 other addons are up to date

status -v still lists every addon, up-to-date ones included.

The No addons found guard for an empty addon directory is untouched — that is a different case from "everything is up to date".

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (5b409e7) to head (f9c58ea).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #55   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          583       584    +1     
  Branches        97        98    +1     
=========================================
+ Hits           583       584    +1     

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