fix: replace return null with empty tags

components/ui/chart.tsx

@@ -73,7 +73,7 @@ const ChartStyle = ({ id, config }: { id: string; config: ChartConfig }) => {
   )
 
   if (!colorConfig.length) {
-    return null
+    return <></>;
   }
 
   return (
@@ -135,7 +135,7 @@ const ChartTooltipContent = React.forwardRef<
 
     const tooltipLabel = React.useMemo(() => {
       if (hideLabel || !payload?.length) {
-        return null
+        return <></>;
       }
 
       const [item] = payload
@@ -155,7 +155,7 @@ const ChartTooltipContent = React.forwardRef<
       }
 
       if (!value) {
-        return null
+        return <></>;
       }
 
       return <div className={cn("font-medium", labelClassName)}>{value}</div>
@@ -170,7 +170,7 @@ const ChartTooltipContent = React.forwardRef<
     ])
 
     if (!active || !payload?.length) {
-      return null
+      return <></>;
     }
 
     const nestLabel = payload.length === 1 && indicator !== "dot"
@@ -273,7 +273,7 @@ const ChartLegendContent = React.forwardRef<
     const { config } = useChart()
 
     if (!payload?.length) {
-      return null
+      return <></>;
     }
 
     return (