fix: fix zero axis position when no zero bucket present #14

Job	Run time
Mixins tests	2m 18s
Go tests with previous Go version	6m 45s
Go tests	24m 33s
Build Prometheus for common architectures (0)	7m 9s
Build Prometheus for common architectures (1)	6m 28s
UI tests	2m 26s
Go tests on Windows	6m 16s
Build Prometheus for common architectures (2)	6m 31s
Build Prometheus for all architectures	0s
fuzzing	0s
golangci-lint	27s
codeql / Analyze (go)	20m 26s
codeql / Analyze (javascript)	1m 53s
Publish UI on npm Registry	1m 21s
Publish main branch artifacts	0s
Publish release artefacts	0s
	1h 26m 33s

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