Table: add value sanity check

src/components/Table.js

@@ -70,7 +70,7 @@ export default initial_vnode => {
 				columns = model.data(offset, limit) && model.data(offset, limit).length && Object.keys(model.data(offset, limit)[0]).map(key => ({label: key})) || []
 				// merge column options
 				columns = columns.map(
-					column => column.label in initial_vnode.attrs.columns_options
+					column => initial_vnode.attrs.columns_options && initial_vnode.attrs.columns_options[column.label]
 						? {...initial_vnode.attrs.columns_options[column.label], ...column} : column
 				).filter(column => !('display' in column) || column.display != false)
 			}