convert switch -> if: ignore whitespaces (IDEA-165260)

java/java-impl/src/com/intellij/codeInsight/daemon/impl/quickfix/ConvertSwitchToIfIntention.java

@@ -296,6 +296,7 @@ public class ConvertSwitchToIfIntention implements IntentionAction {
   }
 
   private static void appendElement(PsiElement element, @NonNls StringBuilder out, CommentTracker commentTracker) {
+    if (element instanceof PsiWhiteSpace) return;
     if (element instanceof PsiBreakStatement) {
       final PsiBreakStatement breakStatement = (PsiBreakStatement)element;
       final PsiIdentifier identifier = breakStatement.getLabelIdentifier();

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/convertSwitchToIf/after4.java

@@ -5,7 +5,6 @@ class Precedence {
     int a = 10;
       if ((a & 1) == 0) {
           System.out.println("0");
-
       } else if ((a & 1) == 1) {
           System.out.println("1");
       }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/convertSwitchToIf/afterString.java

@@ -9,7 +9,6 @@ class X {
       //comment7
       //comment8
       if ("case1".equals(value)) {//comment2
-
       } else if ("case2".equals(value)) {
       } else {
       }