prevent extension gallery error on dev setup

src/vs/base/common/paging.ts

@@ -105,14 +105,18 @@ export class PagedModel<T> implements IPagedModel<T> {
 	}
 }
 
+export function singlePagePager<T>(elements: T[]): IPager<T> {
+	return {
+		firstPage: elements,
+		total: elements.length,
+		pageSize: elements.length,
+		getPage: null
+	};
+}
+
 export class SinglePagePagedModel<T> extends PagedModel<T> {
 	constructor(elements: T[]) {
-		super({
-			firstPage: elements,
-			total: elements.length,
-			pageSize: elements.length,
-			getPage: null
-		});
+		super(singlePagePager(elements));
 	}
 }
 

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

@@ -11,7 +11,7 @@ import { index } from 'vs/base/common/arrays';
 import { ThrottledDelayer } from 'vs/base/common/async';
 import { TPromise } from 'vs/base/common/winjs.base';
 import { IDisposable, dispose } from 'vs/base/common/lifecycle';
-import { IPager, mapPager } from 'vs/base/common/paging';
+import { IPager, mapPager, singlePagePager } from 'vs/base/common/paging';
 import { IExtensionManagementService, IExtensionGalleryService, ILocalExtension, IGalleryExtension, IQueryOptions } from 'vs/platform/extensionManagement/common/extensionManagement';
 import * as semver from 'semver';
 
@@ -203,6 +203,13 @@ export class ExtensionsModel {
 
 				return new Extension(this.stateProvider, null, gallery);
 			});
+		})
+		.then(null, err => {
+			if (/No extension gallery service configured/.test(err.message)) {
+				return TPromise.as(singlePagePager([]));
+			}
+
+			return TPromise.wrapError(err);
 		});
 	}