extract functional: skip if element was invalidated (IDEA-174178)

when typed to the editor between dialog is closed and popup was shown

java/java-impl/src/com/intellij/refactoring/introduceParameter/IntroduceParameterHandler.java

@@ -639,6 +639,9 @@ public class IntroduceParameterHandler extends IntroduceHandlerBase {
                                                   final PsiType selectedType,
                                                   final ExtractMethodProcessor processor, 
                                                   final PsiElement[] elements) {
+    if (!elements[0].isValid()) {
+      return;
+    }
     final PsiElement commonParent = findCommonParent(elements);
     if (commonParent == null) {
       LOG.error("Should have common parent:" + Arrays.toString(elements));

java/java-impl/src/com/intellij/refactoring/introduceVariable/IntroduceFunctionalVariableHandler.java

@@ -115,6 +115,7 @@ public class IntroduceFunctionalVariableHandler extends IntroduceVariableHandler
                                             Editor editor,
                                             MyExtractMethodProcessor processor,
                                             PsiElement[] elements) {
+    if (!elements[0].isValid()) return;
     if (!CommonRefactoringUtil.checkReadOnlyStatus(project, elements[0])) return;
     MyExtractMethodProcessor physicalProcessor =
       new MyExtractMethodProcessor(project, editor, elements,