Merge VS Code 1.31.1 (#4283)

src/vs/base/common/assert.ts

@@ -7,7 +7,7 @@
  * Throws an error with the provided message if the provided value does not evaluate to a true Javascript value.
  */
 export function ok(value?: any, message?: string) {
-	if (!value || value === null) {
+	if (!value) {
 		throw new Error(message ? 'Assertion failed (' + message + ')' : 'Assertion Failed');
 	}
 }