RFR: 8252999: replace all String.equals("") usages with String.isEmpty()

[Kevin Rushforth]

On Wed, 9 Sep 2020 07:57:48 GMT, Dmitriy Dumanskiy <github.com+1536494+doom369 at openjdk.org> wrote:

>> @doom369 jcheck requires an associated issue
>
> @mrserb hello. Thanks for the review. Any further actions required from me?

Before this Enhancement can be formally reviewed, you will need a JBS bug ID. If you are already working with a
Committer or Reviewer in the `jdk` project who has agreed to sponsor your change, they can file the Enhancement
request. Otherwise, you can file it using the web interface at [bugreport.java.com](https://bugreport.java.com/). Once
you have a JBS bug ID, you need to edit the PR title to include that bug ID (without the `JDK-`) replacing
"Improvement".

Since this PR cuts across many functional areas (each gray label represents a functional area), you should expect a
longer review process, since someone from each functional area will need to look at the changes in their area (like
@mrserb started to do for the `2d` area).

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PR: https://git.openjdk.java.net/jdk/pull/29