New: Health check for import lists with missing root folders

New: Show missing root folder path in edit for Import List

(cherry picked from commit ae196af2ad368d49fde2358f0987ed7650c7f29c)

Closes #821

frontend/src/Components/Form/RootFolderSelectInputOption.js

@@ -10,6 +10,7 @@ function RootFolderSelectInputOption(props) {
     value,
     name,
     freeSpace,
+    isMissing,
     isMobile,
     ...otherProps
   } = props;
@@ -29,11 +30,20 @@ function RootFolderSelectInputOption(props) {
         <div>{text}</div>
 
         {
-          freeSpace != null &&
+          freeSpace == null ?
+            null :
             <div className={styles.freeSpace}>
               {formatBytes(freeSpace)} Free
             </div>
         }
+
+        {
+          isMissing ?
+            <div className={styles.isMissing}>
+              Missing
+            </div> :
+            null
+        }
       </div>
     </EnhancedSelectInputOption>
   );
@@ -43,6 +53,7 @@ RootFolderSelectInputOption.propTypes = {
   name: PropTypes.string.isRequired,
   value: PropTypes.string.isRequired,
   freeSpace: PropTypes.number,
+  isMissing: PropTypes.bool,
   isMobile: PropTypes.bool.isRequired
 };