[Management] Show internal indices when toggled even if there are no other indices (#19618)

* Ensure we only show the empty state component if they have no data indices AND the include system indices is not checked

* Add snapshot test for bug find

src/core_plugins/kibana/public/management/sections/indices/create_index_pattern_wizard/__tests__/__snapshots__/create_index_pattern_wizard.test.js.snap

@@ -59,3 +59,26 @@ exports[`CreateIndexPatternWizard renders time field step when step is set to 2
   />
 </div>
 `;
+
+exports[`CreateIndexPatternWizard shows system indices even if there are no other indices if the include system indices is toggled 1`] = `
+<div>
+  <Header
+    isIncludingSystemIndices={true}
+    onChangeIncludingSystemIndices={[Function]}
+  />
+  <StepIndexPattern
+    allIndices={
+      Array [
+        Object {
+          "name": ".kibana ",
+        },
+      ]
+    }
+    esService={Object {}}
+    goToNextStep={[Function]}
+    initialQuery=""
+    isIncludingSystemIndices={true}
+    savedObjectsClient={Object {}}
+  />
+</div>
+`;

src/core_plugins/kibana/public/management/sections/indices/create_index_pattern_wizard/__tests__/create_index_pattern_wizard.test.js

@@ -77,6 +77,25 @@ describe('CreateIndexPatternWizard', () => {
     expect(component).toMatchSnapshot();
   });
 
+  it('shows system indices even if there are no other indices if the include system indices is toggled', async () => {
+    const component = shallow(
+      <CreateIndexPatternWizard
+        loadingDataDocUrl={loadingDataDocUrl}
+        initialQuery={initialQuery}
+        services={services}
+      />
+    );
+
+    component.setState({
+      isInitiallyLoadingIndices: false,
+      isIncludingSystemIndices: true,
+      allIndices: [{ name: '.kibana ' }]
+    });
+
+    await component.update();
+    expect(component).toMatchSnapshot();
+  });
+
   it('renders index pattern step when there are indices', async () => {
     const component = shallow(
       <CreateIndexPatternWizard

src/core_plugins/kibana/public/management/sections/indices/create_index_pattern_wizard/create_index_pattern_wizard.js

@@ -125,7 +125,7 @@ export class CreateIndexPatternWizard extends Component {
     }
 
     const hasDataIndices = allIndices.some(({ name }) => !name.startsWith('.'));
-    if (!hasDataIndices) {
+    if (!hasDataIndices && !isIncludingSystemIndices) {
       return <EmptyState onRefresh={this.fetchIndices} />;
     }