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kotlinlang

#68 Javadoc generation fails with NPE
[Kotlin/dokka] Issue created by <https://github.com/jankotek|jankotek>
I am using Dokka on `MapDB`. Normal format works well, but javadoc generation fails with NPE exception after it generated a few pages. I am using dokka 0.9.7

I need to pass tools.jar with javadoc into classpath:
```java  -cp ~/downloads/dokka-fatjar.jar:/opt/jdk8/lib/tools.jar org.jetbrains.dokka.MainKt src/main/java/  -format javadoc
```

And error output:

```Generating out/doc/org/mapdb/BTreeMap.BTreeBoundIterator.html...
Generating out/doc/org/mapdb/BTreeMap.BTreeIterator.html...
Generating out/doc/org/mapdb/BTreeMap.html...
Generating out/doc/org/mapdb/BTreeMapJava.html...
Generating out/doc/org/mapdb/BTreeMapJava.BinaryGet.html...
Generating out/doc/org/mapdb/Atomic.Boolean.html...
Generating out/doc/org/mapdb/DataInput2.ByteArray.html...
ERROR: java.lang.NullPointerException
done in 4 secs
generation completed with 1176 warnings
```

Source code on which it fails is here:
<https://github.com/jankotek/mapdb/releases/tag/mapdb-3.0.0-M6>