fix(formatting): Fix formatting bug when an empty span is not aligned… #738

Job	Run time
Check fmt & build docs	17s
Minimal versions check (ubuntu-latest)	40s
Minimal versions check (macOS-latest)	38s
Minimal versions check (windows-latest)	51s
Miri	4m 32s
Build & Test (1.56.0, ubuntu-latest)	4m 21s
Build & Test (1.56.0, macOS-latest)	8m 30s
Build & Test (1.56.0, windows-latest)	7m 44s
Build & Test (stable, ubuntu-latest)	41s
Build & Test (stable, macOS-latest)	1m 21s
Build & Test (stable, windows-latest)	3m 25s
	33m 0s

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