Issue #14625: fix inspection violation OptionalGetWithoutIsPresent JavaParserTest testSingleLineComment

[MANISH-K-07]

Part of #14625

Deals with one problem of OptionalGetWithoutIsPresent inspection.

<problem>
<file>file://$PROJECT_DIR$/src/test/java/com/puppycrawl/tools/checkstyle/JavaParserTest.java</file>
<line>114</line>
<module>project</module>
<package>com.puppycrawl.tools.checkstyle</package>
<entry_point TYPE="method" FQNAME="com.puppycrawl.tools.checkstyle.JavaParserTest void testAppendHiddenSingleLineCommentNodes()"/>
<problem_class id="OptionalGetWithoutIsPresent" severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Optional.get() is called without isPresent() check</problem_class>
<description><code>Optional.get()</code> without 'isPresent()' check</description>
<highlighted_element>get</highlighted_element>
<language>JAVA</language>
<offset>52</offset>
<length>3</length>
</problem>

https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html
https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html#isPresent--
https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html#get--

https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html#orElseThrow-java.util.function.Supplier-

[MANISH-K-07]

Green inspections ci....
https://app.circleci.com/pipelines/github/checkstyle/checkstyle/25242/workflows/01a98bb4-58f8-453a-b5cd-2cf18309ce15/jobs/577755?invite=true#step-104-109_91

failing ci/circleci: javac21 due to some network response issue, irrelevant here I believe.
EDIT: error gone on rebase, obviously

[MANISH-K-07]

@romani ,
If the changes of this PR are approved, then I will proceed with other violations concerning this inspection.
(there are a lot more)

[nrmancuso]

Item:

[nrmancuso]

Please just use Optional#orElseThrow

[MANISH-K-07]

@nrmancuso , orElseThrow requires a Supplier argument, only default constructor is compatible.
Without arg to Ctor, we get another inspection problem NewExceptionWithoutArguments

We have to set default to NullPointerException if we want to use this method.

[MANISH-K-07]

Please see if the change is okay.

We don't have any inspection problems now :
https://app.circleci.com/pipelines/github/checkstyle/checkstyle/25317/workflows/f58f4c4d-4e4a-4371-97ca-1e215f61dbe2/jobs/581130?invite=true#step-103-4471_36

[nrmancuso]

@romani , If the changes of this PR are approved, then I will proceed with other violations concerning this inspection. (there are a lot more)

@MANISH-K-07 we will probably not be able to take a generic approach to this inspection unless all violations are in test classes. Any that are in test classes can be sent in one PR

[MANISH-K-07]

@nrmancuso , Please also see #14810 , #14814 , #14815 related to this issue

I have moved TailRecursion problems to new issue like you suggested :)