better Exception message for SchemaError on non-dicts
better Exception message for SchemaError on non-dicts

Lujeni/validictory,rhettg/validictory,sunlightlabs/validictory,soulrebel/validictory,alonho/validictory,mgrandi/validictory,stxnext/validictory,travelbird/validictory,pombredanne/validictory,msabramo/validictory,andretw/validmore,andrecp/validictory,MeilleursAgents/validictory,enotodden/validictory,dmr/validictory,brotchie/validictory