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/RootFolderSelectInputConnector.js

@@ -9,14 +9,17 @@ const ADD_NEW_KEY = 'addNew';
 function createMapStateToProps() {
   return createSelector(
     (state) => state.settings.rootFolders,
+    (state, { value }) => value,
+    (state, { includeMissingValue }) => includeMissingValue,
     (state, { includeNoChange }) => includeNoChange,
-    (rootFolders, includeNoChange) => {
+    (rootFolders, value, includeMissingValue, includeNoChange) => {
       const values = rootFolders.items.map((rootFolder) => {
         return {
           key: rootFolder.path,
           value: rootFolder.path,
           name: rootFolder.name,
-          freeSpace: rootFolder.freeSpace
+          freeSpace: rootFolder.freeSpace,
+          isMissing: false
         };
       });
 
@@ -25,7 +28,8 @@ function createMapStateToProps() {
           key: 'noChange',
           value: '',
           name: 'No Change',
-          isDisabled: true
+          isDisabled: true,
+          isMissing: false
         });
       }
 
@@ -39,6 +43,15 @@ function createMapStateToProps() {
         });
       }
 
+      if (includeMissingValue && !values.find((v) => v.key === value)) {
+        values.push({
+          key: value,
+          value,
+          isMissing: true,
+          isDisabled: true
+        });
+      }
+
       values.push({
         key: ADD_NEW_KEY,
         value: '',