added catch for typeError in gsmmodem (caused by receiving an sms<160 chars)
added catch for typeError in gsmmodem (caused by receiving an sms<160 chars)

eHealthAfrica/rapidsms,dimagi/rapidsms-core-dev,lsgunth/rapidsms,peterayeni/rapidsms,rapidsms/rapidsms-core-dev,eHealthAfrica/rapidsms,peterayeni/rapidsms,ehealthafrica-ci/rapidsms,caktus/rapidsms,caktus/rapidsms,peterayeni/rapidsms,unicefuganda/edtrac,unicefuganda/edtrac,ehealthafrica-ci/rapidsms,lsgunth/rapidsms,catalpainternational/rapidsms,dimagi/rapidsms,rapidsms/rapidsms-core-dev,dimagi/rapidsms,unicefuganda/edtrac,ehealthafrica-ci/rapidsms,eHealthAfrica/rapidsms,ken-muturi/rapidsms,catalpainternational/rapidsms,caktus/rapidsms,catalpainternational/rapidsms,ken-muturi/rapidsms,peterayeni/rapidsms,lsgunth/rapidsms,ken-muturi/rapidsms,lsgunth/rapidsms,dimagi/rapidsms-core-dev,catalpainternational/rapidsms