saml2/idp/SSOService: Fix exception handling from authentication modules.
saml2/idp/SSOService: Fix exception handling from authentication modules.

Thanks to Ernesto Revilla for finding and fixing this bug.

git-svn-id: a243b28a2a52d65555a829a95c8c333076d39ae1@1778 44740490-163a-0410-bde0-09ae8108e29a

dnmvisser/simplesamlphp,girgen/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,sitya/simplesamlphp,sylvainmed/simplesamlphp,dzuelke/simplesamlphp,dialogik/simplesamlphp,ghalse/simplesamlphp,dnmvisser/simplesamlphp,jschlyter/simplesamlphp,madmatt/simplesamlphp,Kunstmaan/simplesamlphp,cwaldbieser/simplesamlphp,dialogik/simplesamlphp,grnet/simplesamlphp,ghalse/simplesamlphp,simplesamlphp/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,sylvainmed/simplesamlphp,simplesamlphp/simplesamlphp,gtkrug/simplesamlphp,dzuelke/simplesamlphp,cwaldbieser/simplesamlphp,gtkrug/simplesamlphp,dnmvisser/simplesamlphp,shoaibali/simplesamlphp,maytechnet/simplesamlphp,simplesamlphp/simplesamlphp,madmatt/simplesamlphp,jschlyter/simplesamlphp,dnmvisser/simplesamlphp,BrettMerrick/simplesamlphp,sylvainmed/simplesamlphp,jschlyter/simplesamlphp,girgen/simplesamlphp,shoaibali/simplesamlphp,dialogik/simplesamlphp,gtkrug/simplesamlphp,shoaibali/simplesamlphp,sitya/simplesamlphp,sitya/simplesamlphp,dialogik/simplesamlphp,ghalse/simplesamlphp,sitya/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,Kunstmaan/simplesamlphp,grnet/simplesamlphp,jschlyter/simplesamlphp,jschlyter/simplesamlphp,maytechnet/simplesamlphp,dialogik/simplesamlphp,ghalse/simplesamlphp,Kunstmaan/simplesamlphp,simplesamlphp/simplesamlphp,dzuelke/simplesamlphp,shoaibali/simplesamlphp,grnet/simplesamlphp,dzuelke/simplesamlphp,grnet/simplesamlphp,girgen/simplesamlphp,maytechnet/simplesamlphp,maytechnet/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,cwaldbieser/simplesamlphp,girgen/simplesamlphp,BrettMerrick/simplesamlphp,sylvainmed/simplesamlphp,BrettMerrick/simplesamlphp,BrettMerrick/simplesamlphp,Kunstmaan/simplesamlphp,madmatt/simplesamlphp,girgen/simplesamlphp,gtkrug/simplesamlphp,madmatt/simplesamlphp,cwaldbieser/simplesamlphp