Merge branch 'ink-fix' into 'staging'

kill the upload icon if ink call fails

See merge request !11

app/components/BookBuilder/Chapter/ChapterTitle.jsx

@@ -13,7 +13,7 @@ class ChapterTitle extends React.Component {
 
   renderHasContent () {
     const { chapter, type } = this.props
-    const source = chapter.source
+    const source = chapter.source || ''
     const hasContent = source.trim().length > 0
 
     if (!hasContent) return null

app/components/BookBuilder/Chapter/UploadButton.jsx

@@ -25,7 +25,7 @@ export class UploadButton extends React.Component {
       update(chapter)
       toggleUpload()
     }).catch((error) => {
-      console.err('INK error', error)
+      console.error('INK error', error)
       toggleUpload()
     })
   }