[MRELEASE-1111] release:prepare reformat empty tags

**[Slawomir Jaranowski](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=slawekjaranowski)** opened **[MRELEASE-1111](https://issues.apache.org/jira/browse/MRELEASE-1111?redirect=false)** and commented

When we have in pom empty tags like:

```java

```

code is changed to:

```java

```

one more space is adde for empty tags.

Not corresponding lines should not be changed at all.

---

**Affects:** 3.0.0-M7

**Issue Links:**
- [MPOM-377](https://issues.apache.org/jira/browse/MPOM-377) Add space before close empty elements in poms

- [MRELEASE-850](https://issues.apache.org/jira/browse/MRELEASE-850) mvn release:prepare reformats pom.xml comments

1 votes, 2 watchers

Start by reproducing the release:prepare behavior with a pom.xml containing the empty tags shown in the issue, and inspect the release:prepare formatting path. Done means unrelated empty tags remain unchanged and the generated pom.xml no longer gains a space before their closing slash.

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