Fixed lint errors.

src/components/fields/_DataProperty.jsx

@@ -40,6 +40,7 @@ export default class DataProperty extends React.Component {
     onDeleteStop: PropTypes.func,
     onAddStop: PropTypes.func,
     fieldName: PropTypes.string,
+    fieldType: PropTypes.string,
     fieldSpec: PropTypes.object,
     value: PropTypes.oneOfType([
       PropTypes.object,

src/components/fields/_ExpressionProperty.jsx

@@ -15,6 +15,7 @@ export default class ExpressionProperty extends React.Component {
   static propTypes = {
     onDelete: PropTypes.func,
     fieldName: PropTypes.string,
+    fieldType: PropTypes.string,
     fieldSpec: PropTypes.object,
     value: PropTypes.any,
     errors: PropTypes.object,