Add not-null annotation to avoid warnings on getProjectDescriptor()

idea/idea-test-framework/src/org/jetbrains/kotlin/idea/test/KotlinWithJdkAndRuntimeLightProjectDescriptor.java

@@ -34,11 +34,16 @@ public class KotlinWithJdkAndRuntimeLightProjectDescriptor extends KotlinJdkAndL
         super(libraryFiles);
     }
 
+    @NotNull
     public static final KotlinWithJdkAndRuntimeLightProjectDescriptor INSTANCE = new KotlinWithJdkAndRuntimeLightProjectDescriptor();
+
+    @NotNull
     public static final KotlinWithJdkAndRuntimeLightProjectDescriptor INSTANCE_WITH_KOTLIN_TEST = new KotlinWithJdkAndRuntimeLightProjectDescriptor(
             Arrays.asList(ForTestCompileRuntime.runtimeJarForTests(),
                           PathUtil.getKotlinPathsForDistDirectory().getKotlinTestPath())
     );
+
+    @NotNull
     public static final KotlinWithJdkAndRuntimeLightProjectDescriptor INSTANCE_FULL_JDK = new KotlinWithJdkAndRuntimeLightProjectDescriptor() {
         @Override
         public Sdk getSdk() {

idea/idea-test-framework/src/org/jetbrains/kotlin/idea/test/ProjectDescriptorWithStdlibSources.java

@@ -26,6 +26,7 @@ import org.jetbrains.annotations.NotNull;
 import java.io.File;
 
 public class ProjectDescriptorWithStdlibSources extends KotlinWithJdkAndRuntimeLightProjectDescriptor {
+    @NotNull
     public static final ProjectDescriptorWithStdlibSources INSTANCE = new ProjectDescriptorWithStdlibSources();
 
     @Override