Histogram: Handling (error messages) for undrawably small bucket sizes

We received a couple of customer complaints recently due to some scenarios where undrawably small bucket sizes led to browser crashes or unrendered visualizations. We can catch this case and flag it to users proactively. The key parts of the code which fail if this happens are: - https://github.com/grafana/grafana/blob/f3da78503749b66b931643dc4f38efec83904ae7/public/app/plugins/panel/histogram/Histogram.tsx#L79 can be a divide-by-zero - https://github.com/grafana/grafana/blob/f3da78503749b66b931643dc4f38efec83904ae7/packages/grafana-data/src/transformations/transformers/histogram.ts#L203 can be a divide-by-zero, and leads to nonsense buckets - https://github.com/grafana/grafana/blob/f3da78503749b66b931643dc4f38efec83904ae7/public/app/plugins/panel/histogram/Histogram.tsx#L50-L62 (this just bugs me - the first method can have an optional index which defaults to 0)