Merge branch 'no-children' of https://github.com/johnjbarton/jasmine into 4.0

* Merges #1742 from @johnjbarton

src/core/Env.js

@@ -1097,11 +1097,7 @@ getJasmineRequireObj().Env = function(j$) {
       }
       addSpecsToSuite(suite, specDefinitions);
       if (suite.parentSuite && !suite.children.length) {
-        this.deprecated(
-          'describe with no children (describe() or it()) is ' +
-            'deprecated and will be removed in a future version of Jasmine. ' +
-            'Please either remove the describe or add children to it.'
-        );
+        throw new Error('describe with no children (describe() or it())');
       }
       return suite;
     };