Strict null check configuration service

src/tsconfig.strictNullChecks.json

@@ -402,6 +402,7 @@
 		"./vs/platform/configuration/common/configurationModels.ts",
 		"./vs/platform/configuration/common/configurationRegistry.ts",
 		"./vs/platform/configuration/node/configuration.ts",
+		"./vs/platform/configuration/node/configurationService.ts",
 		"./vs/platform/configuration/test/common/testConfigurationService.ts",
 		"./vs/platform/contextkey/browser/contextKeyService.ts",
 		"./vs/platform/contextkey/common/contextkey.ts",

src/vs/platform/configuration/node/configurationService.ts

@@ -86,7 +86,7 @@ export class ConfigurationService extends Disposable implements IConfigurationSe
 	}
 
 	reloadConfiguration(folder?: IWorkspaceFolder): Promise<void> {
-		return folder ? Promise.resolve(null) :
+		return folder ? Promise.resolve(void 0) :
 			this.userConfiguration.reload().then(userConfigurationModel => this.onDidChangeUserConfiguration(userConfigurationModel));
 	}