gradle tests: don't fail with exceptions from tearDown() if real JDK wasn't found

plugins/gradle/testSources/org/jetbrains/plugins/gradle/importing/GradleImportingTestCase.java

@@ -111,6 +111,11 @@ public abstract class GradleImportingTestCase extends ExternalSystemImportingTes
 
   @Override
   public void tearDown() throws Exception {
+    if (myJdkHome == null) {
+      //super.setUp() wasn't called
+      return;
+    }
+
     try {
       new WriteAction() {
         @Override