added exception re-throw when HttpRequest fails in OpenSim.Modules.Currency.dll
added exception re-throw when HttpRequest fails in OpenSim.Modules.Currency.dll

BogusCurry/arribasim-dev,Michelle-Argus/ArribasimExtract,BogusCurry/arribasim-dev,Michelle-Argus/ArribasimExtract,BogusCurry/arribasim-dev,BogusCurry/arribasim-dev,BogusCurry/arribasim-dev,Michelle-Argus/ArribasimExtract,BogusCurry/arribasim-dev,Michelle-Argus/ArribasimExtract,Michelle-Argus/ArribasimExtract,Michelle-Argus/ArribasimExtract