src/vs/platform/userDataSync/common/settingsSync.ts/SettingsSynchroniser/hasLocalData
class SettingsSynchroniser:	async hasLocalData(): Promise<boolean> {
		try {
			const localFileContent = await this.getLocalFileContent();
			if (localFileContent) {
				const formatUtils = await this.getFormattingOptions();
				const content = edit(localFileContent.value.toString(), [CONFIGURATION_SYNC_STORE_KEY], undefined, formatUtils);
				return !isEmpty(content);
			}
		} catch (error) {
			if ((<FileOperationError>error).fileOperationResult !== FileOperationResult.FILE_NOT_FOUND) {
				return true;
			}
		}
		return false;
	}