Add checks to energy dashboard for when preferences are empty (#19765)

* Forbid completing energy dashboard setup unless at least one statistic is selected
* If energy setup was completed but there are no sources available, start setup wizard again

src/panels/energy/cards/energy-setup-wizard-card.ts

@@ -137,6 +137,21 @@ export class EnergySetupWizard extends LitElement implements LovelaceCard {
     if (!this._preferences) {
       return;
     }
+    // User made no selections during setup
+    if (
+      this._preferences.device_consumption.length === 0 &&
+      this._preferences.energy_sources.length === 0
+    ) {
+      showAlertDialog(this, {
+        title: this.hass.localize(
+          "ui.panel.energy.setup.no_statistics_selected_title"
+        ),
+        text: this.hass.localize(
+          "ui.panel.energy.setup.no_statistics_selected_description"
+        ),
+      });
+      return;
+    }
     try {
       this._preferences = await saveEnergyPreferences(
         this.hass,

src/panels/energy/strategies/energy-view-strategy.ts

@@ -44,6 +44,14 @@ export class EnergyViewStrategy extends ReactiveElement {
       return view;
     }
 
+    // No energy sources available, start from scratch
+    if (
+      prefs!.device_consumption.length === 0 &&
+      prefs!.energy_sources.length === 0
+    ) {
+      return setupWizard();
+    }
+
     view.type = "sidebar";
 
     const hasGrid = prefs.energy_sources.find(

src/translations/en.json

@@ -6929,7 +6929,9 @@
           "next": "Next",
           "back": "Back",
           "done": "Show me my energy dashboard!",
-          "step": "Step {step} of {steps}"
+          "step": "Step {step} of {steps}",
+          "no_statistics_selected_title": "No statistics selected",
+          "no_statistics_selected_description": "You must select at least one statistic to finish setting up your Energy dashboard."
         },
         "charts": {
           "stat_house_energy_meter": "Total energy consumption",