[Patch] [CLA] test_FloatingPane.html gives an error with FF 2

[guest]

test_FloatingPane.html gives an error with FF 2 because it doesn't like when a widget initializes a member variable to null. Currently, dojox.layout.FloatingPane? initializes dockTo to null, so when we assign declaratively a value to dockTo, FF chokes with:

ReferenceError: alternateDock is not defined message=alternateDock is not defined

In this case to fix the error, we should replace the line 48 of the dojox.layout.FloatingPane? from:

	dockTo: null,

to

	dockTo: "",

My email for any questions issues: angel dot municio at nexaweb dot com

[dante]

(In [12380]) fixes #5833 and fixes #4853 - patch / cla from nexaweb - workaround for floatingpane resizable content. was thinking a template change might be easier, and easier to style in the longrun, but this works for now it seems. thanks for the patch.