Fix issue with conditional questions

Author: spinn

src/components/FlowForm.vue

@@ -319,7 +319,7 @@
 
             if (children) {
               children
-                .filter(q => q.type && q.type.name.indexOf('Question') !== -1)
+                .filter(q => q.type && typeof q.type === 'object' && q.type.name.indexOf('Question') !== -1)
                 .forEach(q => {
                   const props = q.props
                   const componentInstance = this.getInstance(props.id)