updated `Model` read() to return NULL if connection returns null
updated `Model` read() to return NULL if connection returns null

wbeater/lithium,graphis/lithium,SensCritique/lithium,pixelcog/lithium,UnionOfRAD/framework,davidpersson/lithium,m4rcsch/li3_framework,mehlah/lithium,muyehub/lithium,m4rcsch/lithium-core-library,datachand/lithium,whowgames/lithium,qoqa/lithium,jails/lithium,qoqa/lithium,graphis/lithium,davidpersson/lithium,SensCritique/lithium,m4rcsch/lithium-core-library,whowgames/lithium,mehlah/lithium,UnionOfRAD/lithium,pixelcog/lithium,muyehub/lithium,wbeater/lithium,UnionOfRAD/lithium,datachand/lithium,jails/lithium