don't show error if there is no data

plot/README.md

@@ -45,6 +45,10 @@ Second request URL to get JSON for comparison (matrix, cube and discovery plots)
 
 Multiple request URLs to get JSON for comparison (matrix and cube plots)
 
+**`jsons( next?: any[] ) : any[]`**
+
+JSON plot datasets
+
 **`notify( msg: string ) : void`**
 
 Called inside the component for display notification

plot/plot.view.tree

@@ -8,8 +8,9 @@ $mpds_visavis_plot $mol_view
 	json_request? null
 	json_cmp_request? null
 	multi_requests? /string
-	jsons /
+	jsons? /
 	plot_raw null
+	plot_raw_visible null
 	show_setup false
 	notify? null
 	show_demo_warn? false
@@ -25,7 +26,7 @@ $mpds_visavis_plot $mol_view
 			sub / <= error_message \
 	plots *
 		matrix <= Matrix $mpds_visavis_plot_matrix
-			plot_raw <= plot_raw
+			plot_raw <= plot_raw_visible
 			show_setup <= show_setup
 			nonformers_checked? <=> nonformers_checked? false
 			fixel_checked? <=> matrix_fixel_checked? true
@@ -35,7 +36,7 @@ $mpds_visavis_plot $mol_view
 			y_sort? => matrix_y_sort?
 			matrix_click? <=> matrix_click? null
 		plot3d <= Cube $mpds_visavis_plot_cube
-			plot_raw <= plot_raw
+			plot_raw <= plot_raw_visible
 			show_setup <= show_setup
 			show_fixel? <= show_fixel? true
 			nonformers_checked? <=> nonformers_checked?
@@ -48,33 +49,33 @@ $mpds_visavis_plot $mol_view
 			z_sort? => z_sort?
 			cube_click? <=> cube_click? null
 		pd <= Phase $mpds_visavis_plot_phase
-			plot_raw <= plot_raw
+			plot_raw <= plot_raw_visible
 			phase_click? <=> phase_click? null
 			data_demo => phase_data_demo
 		bar <= Bar $mpds_visavis_plot_bar
-			plot_raw <= plot_raw
+			plot_raw <= plot_raw_visible
 			bar_click? <=> bar_click? null
 		discovery <= Discovery $mpds_visavis_plot_discovery
-			plot_raw <= plot_raw
+			plot_raw <= plot_raw_visible
 			show_setup <= show_setup
 			elementals_on? => discovery_elementals_on?
 			discovery_click? <=> discovery_click? null
 		eigenplot <= Eigen $mpds_visavis_plot_eigen
-			plot_raw <= plot_raw
+			plot_raw <= plot_raw_visible
 		pie <= Pie $mpds_visavis_plot_pie
-			plot_raw <= plot_raw
+			plot_raw <= plot_raw_visible
 			pie_click? <=> pie_click? null
 		scatter <= Scatter $mpds_visavis_plot_scatter
-			plot_raw <= plot_raw
+			plot_raw <= plot_raw_visible
 			notify? <=> notify?
 		customscatter <= Customscatter $mpds_visavis_plot_customscatter
-			plot_raw <= plot_raw
+			plot_raw <= plot_raw_visible
 			nplots_changed? <=> nplots_changed? null
 			legend_click? <=> legend_click? null
 		heatmap <= Heatmap $mpds_visavis_plot_heatmap
-			plot_raw <= plot_raw
+			plot_raw <= plot_raw_visible
 		graph <= Graph $mpds_visavis_plot_graph
-			plot_raw <= plot_raw
+			plot_raw <= plot_raw_visible
 			graph_rel? => graph_rel?
 			graph_click? <=> graph_click? null
 			notify? <=> notify?

plot/plot.view.ts

@@ -2,6 +2,12 @@ namespace $.$$ {
 
 	export class $mpds_visavis_plot extends $.$mpds_visavis_plot {
 
+		@ $mol_mem
+		sub( next?: readonly ( any )[] ): readonly ( any )[] {
+			if( !this.plot_raw_visible() ) return []
+			return next ?? super.sub()
+		}
+
 		@ $mol_action
 		static fetch_plot_json( request: RequestInfo | null ){
 			if ( request == null ) return null
@@ -13,7 +19,7 @@ namespace $.$$ {
 		requests() {
 			if( this.json_cmp_request() ) return [ this.json_request()!, this.json_cmp_request()! ]
 			if( this.multi_requests().length > 0 ) return this.multi_requests()
-			return [ this.json_request() ]
+			return this.json_request() ? [ this.json_request() ] : []
 		}
 
 		@ $mol_mem_key
@@ -22,26 +28,9 @@ namespace $.$$ {
 		}
 
 		@ $mol_mem
-		jsons_fetched() {
+		jsons( next?: any[] ) {
 			const requests = this.requests()
-			return requests.map( req => this.json_fetched( req ) )
-		}
-
-		jsons_cached?: any[] | null
-		@ $mol_mem
-		jsons() {
-			try {
-				const jsons = this.jsons_fetched()
-				this.jsons_cached = jsons
-				return jsons
-
-			} catch( error ) {
-				if( !this.$.$mol_promise_like( error ) && this.jsons_cached ) {
-					console.error( error )
-					return this.jsons_cached
-				}
-				throw error
-			}
+			return next ?? requests.map( req => this.json_fetched( req ) )
 		}
 
 		error_visible() {
@@ -50,7 +39,7 @@ namespace $.$$ {
 
 		error_message(): string {
 			try {
-				this.jsons_fetched()
+				this.plot_raw()
 				return ''
 
 			} catch( error: any ) {
@@ -76,16 +65,34 @@ namespace $.$$ {
 
 		@ $mol_mem
 		plot_raw() {
+			if( this.jsons().length == 0 ) return null
+			return $mpds_visavis_plot_raw_from_jsons( this.jsons() )
+		}
+
+		plot_raw_cached?: $mpds_visavis_plot_raw
+		@ $mol_mem
+		plot_raw_visible() {
 			if( this.inconsistent_projection() ) {
 				this.notify( 'Error: inconsistent datasets projection' )
 			}
 
-			return $mpds_visavis_plot_raw_from_jsons( this.jsons() )
+			try {
+				const plot_raw = this.plot_raw()!
+				this.plot_raw_cached = plot_raw
+				return plot_raw
+
+			} catch( error ) {
+				if( !this.$.$mol_promise_like( error ) && this.plot_raw_cached ) {
+					console.error( error )
+					return this.plot_raw_cached
+				}
+				throw error
+			}
 		}
 
 		@ $mol_mem
 		plot_type(): ReturnType< $mpds_visavis_plot_raw['type'] > {
-			return this.plot_raw()?.type()!
+			return this.plot_raw_visible()?.type()!
 		}
 
 		@ $mol_mem