Avoid printing Caveats title when output is empty

Closes #4878
Merge pull request #5806 from federicobond/conditional-caveats

Avoid printing Caveats title when output is empty
Update mysqlworkbench 6.1.7
Merge pull request #5826 from hswong3i/mysqlworkbench-6.1.7

Update mysqlworkbench 6.1.7
revisions to td-toolbelt

- `caskroom_only true` is not needed
- uninstall via `:pkgutil` instead of `:files`
- commented-out future `zap` stanza
- `container_type :naked` since no action is taken on the container
- full path to `mv`
- use `--` after `mv` to disambiguate files
- don't recycle `title` for the filename
use list form for `system` in changes-meter.rb

and give full path to `defaults` executable
fall through to latest OS in programmer-dvorak.rb

Also
- comment some known broken stuff (globs)
- use full path to `rm`
Add screen saver fliqlo 1.5.2
update insertpic to v3.5
Merge pull request #5830 from cwjohnston/update-insertpic

update InsertPic to v3.5
fix basictex filename (install stanza value)

re-use version number in stanzas
closes #5825
MacUpdate Desktop 6.0.2
Add Mailbox
Merge pull request #5832 from rolandwalker/basictex_filename

fix basictex filename (install stanza value)
Update liteicon to version 3.2.1
Merge pull request #5835 from aavilahe/litecoin-3.2.1

Update liteicon to version 3.2.1
Merge pull request #5834 from dlackty/mailbox

Add Mailbox
Merge pull request #5833 from ahbeng/macupdate-desktop-6.0.2

MacUpdate Desktop 6.0.2
Update put.io adder to 2.7
Add stackato client