Removed empty sections from 2.2 release notes.
Removed empty sections from 2.2 release notes.

monetate/django,monetate/django,schinckel/django,monetate/django,felixxm/django,manhhomienbienthuy/django,simonw/django,koordinates/django,freakboy3742/django,manhhomienbienthuy/django,charettes/django,googleinterns/django,apollo13/django,claudep/django,ghickman/django,theo-l/django,georgemarshall/django,solarissmoke/django,pauloxnet/django,wkschwartz/django,MarkusH/django,apollo13/django,freakboy3742/django,blighj/django,googleinterns/django,auvipy/django,georgemarshall/django,schinckel/django,shaib/django,googleinterns/django,shaib/django,rsalmaso/django,adamchainz/django,solarissmoke/django,solarissmoke/django,elena/django,manhhomienbienthuy/django,EmadMokhtar/Django,fenginx/django,timgraham/django,simonw/django,django/django,rsalmaso/django,EmadMokhtar/Django,felixxm/django,adamchainz/django,freakboy3742/django,theo-l/django,fenginx/django,georgemarshall/django,auvipy/django,django/django,django/django,takis/django,theo-l/django,monetate/django,felixxm/django,simonw/django,MarkusH/django,kaedroho/django,atul-bhouraskar/django,apollo13/django,charettes/django,wkschwartz/django,schinckel/django,atul-bhouraskar/django,atul-bhouraskar/django,kaedroho/django,ghickman/django,timgraham/django,adamchainz/django,simonw/django,koordinates/django,ghickman/django,MarkusH/django,rsalmaso/django,koordinates/django,dsanders11/django,takis/django,MarkusH/django,solarissmoke/django,pauloxnet/django,auvipy/django,django/django,charettes/django,wkschwartz/django,rsalmaso/django,wkschwartz/django,schinckel/django,atul-bhouraskar/django,takis/django,elena/django,blighj/django,auvipy/django,fenginx/django,pauloxnet/django,googleinterns/django,takis/django,koordinates/django,kaedroho/django,elena/django,manhhomienbienthuy/django,dsanders11/django,pauloxnet/django,claudep/django,EmadMokhtar/Django,apollo13/django,adamchainz/django,dsanders11/django,charettes/django,fenginx/django,dsanders11/django,ghickman/django,georgemarshall/django,shaib/django,timgraham/django,blighj/django,claudep/django,timgraham/django,elena/django,blighj/django,theo-l/django,claudep/django,shaib/django,felixxm/django