When the blank image url is not set programatically to a local representation, a spacer gif on the site of ext is loaded from the internet. This causes problems when internet or the ext site are not available.
When the blank image url is not set programatically to a local representation, a spacer gif on the site of ext is loaded from the internet. This causes problems when internet or the ext site are not available.

git-svn-id: f03ca5c8a921532f32914eeaa11da0c4ec6e25a1@161 d672c736-503d-0410-a38a-9366997c882b

droolsjbpm/jbpm-designer,porcelli-forks/jbpm-designer,xingguang2013/jbpm-designer,xingguang2013/jbpm-designer,droolsjbpm/jbpm-designer,xingguang2013/jbpm-designer,MetSystem/jbpm-designer,jomarko/jbpm-designer,tsurdilo/jbpm-designer,tsurdilo/jbpm-designer,jvanzyl/wapama,droolsjbpm/jbpm-designer,GunioRobot/wapama,Hasys/jbpm-designer,xingguang2013/jbpm-designer,GunioRobot/wapama,tsurdilo/jbpm-designer,porcelli-forks/jbpm-designer,samarjit/mywapama,fanta-mnix/designer,Le-Andrej/OpenModel-Designer,manstis/jbpm-designer,MetSystem/jbpm-designer,jomarko/jbpm-designer,tsurdilo/jbpm-designer,jomarko/jbpm-designer,fanta-mnix/designer,Le-Andrej/OpenModel-Designer,porcelli-forks/jbpm-designer,Hasys/jbpm-designer,MetSystem/jbpm-designer,jhrcek/jbpm-designer,porcelli-forks/jbpm-designer,Hasys/jbpm-designer,manstis/jbpm-designer,manstis/jbpm-designer,MetSystem/jbpm-designer,samarjit/mywapama,GunioRobot/wapama,jvanzyl/wapama,jhrcek/jbpm-designer,jhrcek/jbpm-designer,ServiceMax-Engineering/wapama,ServiceMax-Engineering/wapama,ServiceMax-Engineering/wapama,jvanzyl/wapama,manstis/jbpm-designer,jhrcek/jbpm-designer,Hasys/jbpm-designer,jomarko/jbpm-designer,samarjit/mywapama,fanta-mnix/designer,Le-Andrej/OpenModel-Designer,droolsjbpm/jbpm-designer