A task with no transfer data shows no progress text

[mastacontrola]

What / why

The Active Tasks grid's column 8 render (fog.task.list.js) always built
timeElapsed / timeRemaining dataCopied of dataTotal (bpm/min) plus a
progress bar, whatever the task's state. A queued task, a snapin task, or
any other non-imaging task never populates the transfer fields, so the
cell rendered literally / of (/min) with an empty bar instead of
nothing. A forum reporter's screenshot showed this on two queued "All
Snapins" tasks.

The render now guards on row.dataTotal: when it is empty/falsy there is
no transfer to describe, so the cell returns '' instead of assembling
the string and the bar. Otherwise the output is unchanged.

Census

Grepped packages/web/management/js for the same ' of ' + '/min)'
renderer shape and for the field names it depends on
(dataCopied/dataTotal/timeElapsed/timeRemaining). Only one copy
exists: fog.task.list.js column 8. No other file (host Tasks tab,
dashboard, etc.) needed the same guard.

Gate test

Added tests/task-progress-cell-empty-without-data.test.php, modeled on
tests/module-state-select-is-legible.test.php. It pins that the
row.dataTotal guard runs before the ' of ' string is assembled.

Proved it's a gate by temporarily removing the guard and re-running:

FAIL (5 of 5):
  - the column 8 progress-cell render was found
  - row.dataTotal is checked
  - the ' of ' string is still built for the non-empty case
  - the dataTotal guard runs BEFORE the " of " string is assembled
  - the guard returns an empty string, not partial markup

Restored the guard and re-ran:

ok  5 checks passed

Other

• FOG_BCACHE_VER bumped 365 -> 366 (JS changed).
• Both phpstan passes clean, unscoped.

🤖 Generated with Claude Code

https://claude.ai/code/session_01F8UmmbQHjihkSkd3r94Jgw