fix: Preserve count=0 in RunClient's charge #520

Job	Run time
PR title check	3s
Docstrings checks / Docstrings checks	15s
Tests / Integration tests (3.11, ubuntu-latest)	2m 12s
Code checks / Spell check	4s
Tests / Integration tests (3.14, ubuntu-latest)	2m 36s
Doc checks / Doc checks / Docs check	1m 21s
Code checks / Actions lint check	31s
Code checks / Lint check / Lint check (3.12)	9s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	38s
Code checks / Lint check / Lint check (3.13)	9s
Code checks / Lint check / Lint check (3.11)	11s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	39s
Code checks / Type check / Type check (3.13)	13s
Code checks / Type check / Type check (3.12)	13s
Code checks / Lint check / Lint check (3.14)	11s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	58s
Code checks / Type check / Type check (3.14)	10s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	43s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 1s
Code checks / Type check / Type check (3.11)	9s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 8s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	43s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 13s
	15m 30s

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