[java-inspections] EA-838138, Fix empty cases

GitOrigin-RevId: b45993878b906f3a5209ad0b968b43f8d872dbbf

java/java-impl/src/com/intellij/codeInspection/EnhancedSwitchMigrationInspection.java

@@ -582,7 +582,8 @@ public class EnhancedSwitchMigrationInspection extends AbstractBaseJavaLocalInsp
       OldSwitchStatementBranch branch = branches.get(i);
       if (!isConvertibleBranch(branch, i != size - 1)) return null;
       PsiStatement[] statements = branch.getStatements();
-      if (branch.isFallthrough() || statements.length == 0) continue;
+      if (branch.isFallthrough() && statements.length == 0) continue;
+      if (statements.length == 0) return null;
       if (statements.length > maxNumberStatementsForExpression) {
         isInfo = true;
       }

java/java-tests/testData/inspection/switchExpressionMigration/beforeEmptyStatement.java

@@ -0,0 +1,13 @@
+// "Replace with 'switch' expression" "false"
+
+public class EnhancedSwitchIntentionBug {
+  public static void main(String[] args) {
+    int x;
+    switch<caret> (args[0]) {
+      case "1":
+      case "2":
+      case "3":
+      default:
+    }
+  }
+}