extract method: don't search for the valid place to insert empty method when nullability state is calculated and containing class is not physical and used as a context only (IDEA-146102)

java/java-impl/src/com/intellij/refactoring/extractMethod/ExtractMethodProcessor.java

@@ -640,7 +640,7 @@ public class ExtractMethodProcessor implements MatchProvider {
       if (classCopy == null) {
         return null;
       }
-      final PsiMethod emptyMethod = (PsiMethod)classCopy.add(generateEmptyMethod("name"));
+      final PsiMethod emptyMethod = (PsiMethod)classCopy.addAfter(generateEmptyMethod("name"), PsiTreeUtil.getParentOfType(classCopy, PsiMember.class));
       prepareMethodBody(emptyMethod, false);
       if (myNotNullConditionalCheck || myNullConditionalCheck) {
         return Nullness.NULLABLE;