created a specific widget for search result to add "no results" message

src/public/app/widgets/search_result.js

@@ -0,0 +1,72 @@
+import TabAwareWidget from "./tab_aware_widget.js";
+import NoteListRenderer from "../services/note_list_renderer.js";
+
+const TPL = `
+<div class="search-result-widget">
+    <style>
+    .search-result-widget {
+        flex-grow: 100000;
+        flex-shrink: 100000;
+        min-height: 0;
+        overflow: auto;
+    }
+    
+    .search-result-widget .note-list {
+        padding: 10px;
+    }
+    
+    .search-no-results, .search-not-executed-yet {
+        margin: 20px;
+        padding: 20px;
+    }
+    </style>
+    
+    <div class="search-no-results alert alert-info">
+        No notes have been found for given search parameters.
+    </div>
+    
+    <div class="search-not-executed-yet alert alert-info">
+        Search has not been executed yet. Click on "Search" button above to see the results.
+    </div>
+    
+    <div class="search-result-widget-content">
+    </div>
+</div>`;
+
+export default class SearchResultWidget extends TabAwareWidget {
+    isEnabled() {
+        return super.isEnabled()
+            && this.note.type === 'search';
+    }
+
+    doRender() {
+        this.$widget = $(TPL);
+        this.$content = this.$widget.find('.search-result-widget-content');
+        this.$noResults = this.$widget.find('.search-no-results');
+        this.$notExecutedYet = this.$widget.find('.search-not-executed-yet');
+        this.contentSized();
+    }
+
+    async refreshWithNote(note) {
+        this.$content.empty();
+        this.$noResults.toggle(note.getChildNoteIds().length === 0 && !!note.searchResultsLoaded);
+        this.$notExecutedYet.toggle(!note.searchResultsLoaded);
+
+        const noteListRenderer = new NoteListRenderer(this.$content, note, note.getChildNoteIds());
+        await noteListRenderer.renderList();
+    }
+
+    searchRefreshedEvent({tabId}) {
+        if (!this.isTab(tabId)) {
+            return;
+        }
+
+        this.refresh();
+    }
+
+    notesReloadedEvent({noteIds}) {
+        if (noteIds.includes(this.noteId)) {
+            this.refresh();
+        }
+    }
+}