Set appendFormattedElement()'s $mode argument default to null.
Set appendFormattedElement()'s $mode argument default to null.

Fixes issue #241
http://symphony-cms.com/discuss/issues/view/241/

johnpuddephatt/symphony-2,blaXXabla/projet_test_symphony,avanteweb/symphony-2,bauhouse/sym-todo-list,yojeek/sym-community,henrysingleton/litmusk,allen/auth.getsymphony.com,brendo/symphony-2,NikoMostWanted/symphony-2,pixelninja/imagick_effects,embarknow/journey-cms,jonmifsud/symphony-2,nils-werner/Bugaroo,DavidForster/symphony-2,rzantolas/Symphony-Test,DavidForster/symphony-2,embarknow/journey-cms,symphonycms/symphony-2,jonmifsud/symphony-2,benesch/hilton-unar,eliksir/norske-webapps,bauhouse/members-forms-ensemble,mazedigital/jcilearn,psychoticmeow/journey-cms,ljonka/symphony-2,TheJester12/issueprompt,ayellowraven/projectplaten,bauhouse/sym-pears,symphonycms/symphony-3,embarknow/journey-cms,ahwayakchih/symphony-2,eliksir/norske-webapps,TheJester12/issueprompt,BloodBrother/symphony-2,ljonka/symphony-2,psychoticmeow/symphony-2,jensscherbl/symphony,bauhouse/sym-pagoda,jurajkapsz/symphony-2,eliksir/norske-webapps,johnpuddephatt/symphony-2,avanteweb/symphony-2,symphonycms/sym-getsymphony,builders/sym-bootstrap,DeuxHuitHuit/symphony-2,brendo/symphony-2,chay83/Symphony-Shopping-Cart-Ensemble,builders/sym-bootstrap,symphonycms/symphony-3,twiro/symphony-2,jdsimcoe/symphony-boilerplate,psychoticmeow/journey-cms,psychoticmeow/journey-cms,bauhouse/Bugaroo,wastemobile/Symphony2.3.6,scottkf/keepflippin--on-symphony,bauhouse/sym-pagoda,ahwayakchih/symphony-2,alexnantel88/symphony-2,roshinebagha/Symphony-Test,bauhouse/sym-todo-list,Titch/Symph-test,astudio/remixhair,astudio/remixhair,BloodBrother/symphony-2,builders/collective,tachyondecay/symphony-2,jdsimcoe/symphony-boilerplate,embarknow/journey-cms,blaXXabla/projet_test_symphony,embarknow/journey-cms,jensscherbl/symphony,mazedigital/jcilearn,thebestsophist/personal-health-diary,symphonycms/symphony-2,jurajkapsz/symphony-2,benesch/hilton-unar,psychoticmeow/journey-cms,allen/auth.getsymphony.com,jdsimcoe/symphony-boilerplate,DeuxHuitHuit/symphony-2,psychoticmeow/journey-cms,bauhouse/Piano-Sonata,davjand/Checkout-Ensemble,bauhouse/members-forms-ensemble,NikoMostWanted/symphony-2,bauhouse/Piano-Sonata,twiro/symphony-2,michael-e/symphony-2,TheJester12/issueprompt,nils-werner/Bugaroo,symphonycms/sym-getsymphony,yojeek/sym-community,mazedigital/jcilearn,thebestsophist/personal-health-diary,builders/collective,Titch/Symph-test,davjand/Checkout-Ensemble,bauhouse/Bugaroo,ayellowraven/projectplaten,jdsimcoe/symphony-boilerplate,wastemobile/Symphony2.3.6,psychoticmeow/symphony-2,henrysingleton/litmusk,bauhouse/sym-pears,chay83/Symphony-Shopping-Cart-Ensemble,roshinebagha/Symphony-Test,rzantolas/Symphony-Test,tachyondecay/symphony-2,alexnantel88/symphony-2,michael-e/symphony-2