Fix microsoft#155878 (microsoft#156197)

Author: sandy081

src/vs/workbench/services/configuration/browser/configurationService.ts

@@ -717,7 +717,7 @@ export class WorkspaceService extends Disposable implements IWorkbenchConfigurat
 			if (e.preserveData) {
 				await Promise.all([
 					this.copyProfileSettings(e.previous.settingsResource, e.profile.settingsResource),
-					this.fileService.copy(e.previous.tasksResource, e.profile.tasksResource)
+					this.copyProfileTasks(e.previous.tasksResource, e.profile.tasksResource)
 				]);
 			}
 			const promises: Promise<ConfigurationModel>[] = [];
@@ -751,6 +751,12 @@ export class WorkspaceService extends Disposable implements IWorkbenchConfigurat
 		await this.fileService.writeFile(to, VSBuffer.fromString(toContent));
 	}
 
+	private async copyProfileTasks(from: URI, to: URI): Promise<void> {
+		if (await this.fileService.exists(from)) {
+			await this.fileService.copy(from, to);
+		}
+	}
+
 	private onDefaultConfigurationChanged(configurationModel: ConfigurationModel, properties?: string[]): void {
 		if (this.workspace) {
 			const previousData = this._configuration.toData();

src/vs/workbench/services/keybinding/browser/keybindingService.ts

@@ -743,7 +743,9 @@ class UserKeybindings extends Disposable {
 
 	private async whenCurrentProfieChanged(e: DidChangeUserDataProfileEvent): Promise<void> {
 		if (e.preserveData) {
-			await this.fileService.copy(e.previous.keybindingsResource, e.profile.keybindingsResource);
+			if (await this.fileService.exists(e.previous.keybindingsResource)) {
+				await this.fileService.copy(e.previous.keybindingsResource, e.profile.keybindingsResource);
+			}
 		}
 		this.watch();
 		this.reloadConfigurationScheduler.schedule();