DashboardScene: Fixes issue with variables without current property (#78481)

public/app/features/dashboard-scene/serialization/transformSaveModelToScene.test.ts

@@ -679,6 +679,7 @@ describe('transformSaveModelToScene', () => {
         error: null,
         description: null,
       };
+
       const migrated = createSceneVariableFromVariableModel(variable);
       const { key, ...rest } = migrated.state;
       expect(rest).toEqual({
@@ -696,6 +697,7 @@ describe('transformSaveModelToScene', () => {
         value: '1m',
       });
     });
+
     it.each(['textbox', 'system'])('should throw for unsupported (yet) variables', (type) => {
       const variable = {
         name: 'query0',
@@ -704,6 +706,42 @@ describe('transformSaveModelToScene', () => {
 
       expect(() => createSceneVariableFromVariableModel(variable as TypedVariableModel)).toThrow();
     });
+
+    it('should handle variable without current', () => {
+      // @ts-expect-error
+      const variable: TypedVariableModel = {
+        id: 'query1',
+        name: 'query1',
+        type: 'datasource',
+        global: false,
+        regex: '/^gdev/',
+        options: [],
+        query: 'prometheus',
+        multi: true,
+        includeAll: true,
+        refresh: 1,
+        allValue: 'Custom all',
+      };
+
+      const migrated = createSceneVariableFromVariableModel(variable);
+      const { key, ...rest } = migrated.state;
+
+      expect(migrated).toBeInstanceOf(DataSourceVariable);
+      expect(rest).toEqual({
+        allValue: 'Custom all',
+        defaultToAll: true,
+        includeAll: true,
+        label: undefined,
+        name: 'query1',
+        options: [],
+        pluginId: 'prometheus',
+        regex: '/^gdev/',
+        text: '',
+        type: 'datasource',
+        value: '',
+        isMulti: true,
+      });
+    });
   });
 
   describe('Repeating rows', () => {

public/app/features/dashboard-scene/serialization/transformSaveModelToScene.ts

@@ -274,8 +274,8 @@ export function createSceneVariableFromVariableModel(variable: TypedVariableMode
   if (variable.type === 'custom') {
     return new CustomVariable({
       ...commonProperties,
-      value: variable.current.value,
-      text: variable.current.text,
+      value: variable.current?.value ?? '',
+      text: variable.current?.text ?? '',
       description: variable.description,
       query: variable.query,
       isMulti: variable.multi,
@@ -288,8 +288,8 @@ export function createSceneVariableFromVariableModel(variable: TypedVariableMode
   } else if (variable.type === 'query') {
     return new QueryVariable({
       ...commonProperties,
-      value: variable.current.value,
-      text: variable.current.text,
+      value: variable.current?.value ?? '',
+      text: variable.current?.text ?? '',
       description: variable.description,
       query: variable.query,
       datasource: variable.datasource,
@@ -306,8 +306,8 @@ export function createSceneVariableFromVariableModel(variable: TypedVariableMode
   } else if (variable.type === 'datasource') {
     return new DataSourceVariable({
       ...commonProperties,
-      value: variable.current.value,
-      text: variable.current.text,
+      value: variable.current?.value ?? '',
+      text: variable.current?.text ?? '',
       description: variable.description,
       regex: variable.regex,
       pluginId: variable.query,