Fix error when printing errorMessage from json schemas
Fix error when printing errorMessage from json schemas

When trying to show error from JsonSchemas and the property is not part of Base schema, an error is raised (Cannot read property 'errorMessage' of undefined).
Add check if the property is part of the schema.

Fixes http://teampulse.telerik.com/view#item/290863

Icenium/icenium-cli,Icenium/icenium-cli