fix: add conditions to finding min positive and max negative #20

Job	Run time
Build Prometheus for common architectures (0)	6m 38s
Check generated parser	13s
fuzzing	0s
Build Prometheus for all architectures	0s
Build Prometheus for common architectures (1)	6m 26s
golangci-lint	28s
Build Prometheus for common architectures (2)	6m 42s
Go tests	14m 30s
More Go tests	4m 36s
Go tests with previous Go version	7m 20s
Mixins tests	2m 10s
UI tests	2m 17s
Go tests on Windows	9m 47s
codeql / Analyze (javascript)	1m 59s
Publish UI on npm Registry	1m 22s
Publish main branch artifacts	0s
Publish release artefacts	0s
	1h 4m 28s

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