#222 Parent target of unnamed frame gives NullException

[georgesz]

Trying to use a form or a link with an _parent as
target gives a NullPointer exception. The fix seems to
be relatively simple:
- add 2 unit tests to WebFrameTest.java that
demonstrate the problem with link and forms.
- add a FrameSelector constructor with a FrameSelector
parent as parameter in FrameSelector.java.
- change newNestedFrame() in FrameHolder.java to use
that new constructor instead of the default constructor
when the relativeName is null or emtpy.
Attached are the modified files.

[georgesz]

Unit test changes that demonstrate the problem and changes that fix it.

[georgesz]

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This was found with HttpUnit 1.6.

[Russell Gold]

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I believe this is the same problem reported as bug #1035949,
and already fixed in CVS. Could you please try the CVS
version to see if your problem still exists?

[georgesz]

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I got the CVS version earlier this week, and it does fix the
problem detected by my test cases. Thank you. Next time I
will try my test cases against the CVS version first.