Add hasChangelog method to display the tab eventually

src/vs/workbench/parts/extensions/electron-browser/extensionEditor.ts

@@ -254,7 +254,10 @@ export class ExtensionEditor extends BaseEditor {
 		this.navbar.onChange(this.onNavbarChange.bind(this, extension), this, this.transientDisposables);
 		this.navbar.push(NavbarSection.Readme, localize('details', "Details"));
 		this.navbar.push(NavbarSection.Contributions, localize('contributions', "Contributions"));
-		this.navbar.push(NavbarSection.Changelog, localize('changelog', "Changelog"));
+
+		if (extension.hasChangelog) {
+			this.navbar.push(NavbarSection.Changelog, localize('changelog', "Changelog"));
+		}
 
 		this.content.innerHTML = '';
 

src/vs/workbench/parts/extensions/electron-browser/extensions.ts

@@ -42,6 +42,7 @@ export interface IExtension {
 	telemetryData: any;
 	getManifest(): TPromise<IExtensionManifest>;
 	getReadme(): TPromise<string>;
+	hasChangelog : boolean;
 	getChangelog() : TPromise<string>;
 }
 

src/vs/workbench/parts/extensions/electron-browser/extensionsWorkbenchService.ts

@@ -187,6 +187,10 @@ class Extension implements IExtension {
 		return this.galleryService.getAsset(readmeUrl).then(asText);
 	}
 
+	get hasChangelog() : boolean {
+		return !!(this.local && this.local.changelogUrl ? this.local.changelogUrl : '');
+	}
+
 	getChangelog() : TPromise<string> {
 		const changelogUrl = this.local && this.local.changelogUrl ? this.local.changelogUrl : '';