Do not annotate bare type parameters as @Nullable

This is to account for the case of, say

     class Function<R> { fun invoke(): R }

it would be a shame to put @Nullable on the return type of the function, and force all callers to check for null,
so we put no annotations

compiler/tests/org/jetbrains/jet/asJava/NullabilityAnnotationsTest.java

@@ -86,6 +86,10 @@ public class NullabilityAnnotationsTest extends KotlinAsJavaTestBase {
         doTest(getTestName(false));
     }
 
+    public void testGeneric() throws Exception {
+        doTest(getTestName(false));
+    }
+
     private void doTest(@NotNull String fqName) {
         PsiClass psiClass = finder.findClass(fqName, GlobalSearchScope.allScope(getProject()));
         if (!(psiClass instanceof KotlinLightClass)) {