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Since `WaitForDA1` would wait until `_deviceAttributes` is non-zero,
we must ensure it's actually non-zero at the end of this handler,
even if there are no parameters.
## Validation Steps Performed
* Mod the Terminal DA1 to be `\x1b[?6c`. No hang ✅
* Mod the Terminal DA1 to be `\x1b[?61c`. No hang ✅
(cherry picked from commit 32ae00f71a)
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