LambdaParameterNameCheck throws NPE when parsing switch expressions

[nrmancuso]

Child of #8658
Check documentation: https://checkstyle.sourceforge.io/config_naming.html#LambdaParameterName

Checks lambda parameter names.

➜  src /usr/lib/jvm/java-14-openjdk/bin/javac --enable-preview --source 14 TestClass.java
➜  src cat config.xml                                                                    
<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
        "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
        "https://checkstyle.org/dtds/configuration_1_3.dtd">
<module name="Checker">
    <module name="TreeWalker">
        <module name="LambdaParameterName"/>
    </module>
</module>
➜  src cat TestClass.java                                                                
import java.util.stream.Stream;

public class TestClass {

    boolean method1(Nums k, String string) { 
        switch (k) {
            case ONE:
                Stream.of(string.split(" "))
                        .map(word -> word.trim()) 
                        .anyMatch(Word -> "in".equals(Word)); // violation
                break;
            default: ;
        }
        return false;
    }

    boolean method2(Nums k, String string) { 
        switch (k) {
            case ONE -> {
                Stream.of(string.split(" "))
                        .map(word -> word.trim())
                        .anyMatch(Word -> "in".equals(Word)); // violation
                System.out.println("case one");
            }
            default -> Stream.of(string.split(" "))
                    .map(word -> word.trim())
                    .anyMatch(Word -> "in".equals(Word)); // violation
        }
        return true;
    }

    boolean method3(Nums k, String string) {
        return switch (k) {
            case ONE:
                yield Stream.of(string.split(" "))
                        .map(word -> word.trim()) 
                        .anyMatch(Word -> "in".equals(Word)); // violation
            default: yield false;
        };
    }

    boolean method4(Nums k, String string) {
        return switch (k) {
            case ONE -> {
                yield Stream.of(string.split(" "))
                        .map(word -> word.trim())
                        .anyMatch(Word -> "in".equals(Word)); // violation
            }
            default -> { yield false; }
        };
    }


    enum Nums {ONE, TWO, THREE}

}
➜  src java -jar /home/nick/IdeaProjects/checkstyle/target/checkstyle-8.36-SNAPSHOT-all.jar -c config.xml TestClass.java
Starting audit...
com.puppycrawl.tools.checkstyle.api.CheckstyleException: Exception was thrown while processing TestClass.java
        at com.puppycrawl.tools.checkstyle.Checker.processFiles(Checker.java:311)
        at com.puppycrawl.tools.checkstyle.Checker.process(Checker.java:221)
        at com.puppycrawl.tools.checkstyle.Main.runCheckstyle(Main.java:408)
        at com.puppycrawl.tools.checkstyle.Main.runCli(Main.java:331)
        at com.puppycrawl.tools.checkstyle.Main.execute(Main.java:190)
        at com.puppycrawl.tools.checkstyle.Main.main(Main.java:125)
Caused by: java.lang.NullPointerException
        at com.puppycrawl.tools.checkstyle.checks.naming.AbstractNameCheck.visitToken(AbstractNameCheck.java:78)
        at com.puppycrawl.tools.checkstyle.checks.naming.LambdaParameterNameCheck.visitToken(LambdaParameterNameCheck.java:117)
        at com.puppycrawl.tools.checkstyle.TreeWalker.notifyVisit(TreeWalker.java:340)
        at com.puppycrawl.tools.checkstyle.TreeWalker.processIter(TreeWalker.java:451)
        at com.puppycrawl.tools.checkstyle.TreeWalker.walk(TreeWalker.java:278)
        at com.puppycrawl.tools.checkstyle.TreeWalker.processFiltered(TreeWalker.java:151)
        at com.puppycrawl.tools.checkstyle.api.AbstractFileSetCheck.process(AbstractFileSetCheck.java:87)
        at com.puppycrawl.tools.checkstyle.Checker.processFile(Checker.java:337)
        at com.puppycrawl.tools.checkstyle.Checker.processFiles(Checker.java:298)
        ... 5 more
Checkstyle ends with 1 errors.

This check should not throw a NPE when parsing this code, we need to update this check.

[romani]

fix is merged