Revision 1781218

Fixed: After creating a new Flexible Birt report, before visualising it you need
 to do other actions
(OFBIZ-9194)

You need to add the data set fields with the Birt Report Designer 
and publish the report. This will be documented with OFBIZ-9188

I thought about graying the button but it was a delicate matter because it uses
a <content element in screen and directly call a view handled from a Groovy 
event.

It was easier to fix the PrepareBirtCall Groovy event. But to be totally sure
I also handled the possible NPE in the BirtViewHandler

I also fixed viewLast error in controller 

Because the files were not committed with the svn:eol-style native property
you will see false changes in this commit. Some files have their svn:eol-style 
native property set. I'll soon commit missing so in new Birt Java files.

I'll also commit a lot of svn:eol-style native property changes for XML and 
Groovy files which have been neglected so far. I'm sorry for that because 
when we do so we loose the annotations history. I will then definitely put in 
place what I suggested in http://markmail.org/message/ffmyw773p65fndey