Set <=0 chart values to null so they render as gaps on a log graph (#25347)

src/components/chart/ha-chart-base.ts

@@ -600,12 +600,32 @@ export class HaChartBase extends LitElement {
   }
 
   private _getSeries() {
-    if (!Array.isArray(this.data)) {
+    const series = ensureArray(this.data).filter(
-      return this.data;
-    }
-    return this.data.filter(
       (d) => !this._hiddenDatasets.has(String(d.name ?? d.id))
     );
+    const yAxis = (this.options?.yAxis?.[0] ?? this.options?.yAxis) as
+      | YAXisOption
+      | undefined;
+    if (yAxis?.type === "log") {
+      // set <=0 values to null so they render as gaps on a log graph
+      return series.map((d) =>
+        d.type === "line"
+          ? {
+              ...d,
+              data: d.data?.map((v) =>
+                Array.isArray(v)
+                  ? [
+                      v[0],
+                      typeof v[1] !== "number" || v[1] > 0 ? v[1] : null,
+                      ...v.slice(2),
+                    ]
+                  : v
+              ),
+            }
+          : d
+      );
+    }
+    return series;
   }
 
   private _getDefaultHeight() {