dosubot[bot] commented on issue #43547: URL: https://github.com/apache/superset/issues/43547#issuecomment-5423317684
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The fix is straightforward: pass `dropna=False` there. **Issue 2: Graph chart returns `'N/A'` instead of `NULL_STRING`** In `Graph/transformProps.ts`, the [`getCategoryName` helper returns the hardcoded string `'N/A'`](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/plugins/plugin-chart-echarts/src/Graph/transformProps.ts#L150-L153) for null categories instead of importing and using `NULL_STRING` from `../constants`. For comparison, the Bubble plugin [correctly imports `NULL_STRING`](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/plugins/plugin-chart-echarts/src/Bubble/transformProps.ts#L39) and uses it for its series name [[1]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/plugins/plugin-chart-echarts/src/Bubble/transformProps.ts#L144-L146). For the Chord diagram, the legacy plugin's [`transformProps.js`](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/plugins/legacy-plugin-chart-chord/src/transformProps.js#L23-L26) passes `queriesData[0].data` straight through, and [`Chord.js` renders node labels directly from the `nodes` array](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/plugins/legacy-plugin-chart-chord/src/Chord.js#L99-L104) without any null substitution — so a `null` node renders as empty text. **Issue 3: Bubble chart tooltip title is blank for NULL entities** In `Bubble/transformProps.ts`, [`formatTooltip`](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/plugins/plugin-chart-echarts/src/Bubble/transformProps.ts#L83-L85) constructs the tooltip title from `params.data[3]` (the entity value). When the entity is `null`, the title ends up empty — `NULL_STRING` is never substituted in the formatter, even though it *is* imported and used for the series name on [line 146](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/plugins/plugin-chart-echarts/src/Bubble/transformProps.ts#L146). **On consolidation:** `NULL_STRING` is currently defined redundantly — in `superset/constants.py` as `"<NULL>"` [[2]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/constants.py#L27) and separately in the eCharts plugin constants. The comment in `constants.py` even notes: ["If you change any constants, make sure to also change utils/common.js"](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/constants.py#L18). Centralizing `NULL_STRING` into `@superset-ui/core` and having all plugins import from there would prevent drift like the Graph `'N/A'` issue. I also see you've filed a related issue about [drill-to-detail showing blank instead of `<NULL>`](https://github.com/apache/superset/issues/41677) — these likely share the same root cause on the frontend side. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](<https://go.dosu.dev/dosubot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=reply-with-mention&utm_term=apache%2Fsuperset>).* --- Docs are dead. Just use [Dosu](https://dosu.dev?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=static-docs-tagline&utm_term=apache%2Fsuperset). 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