In area chapter, make sure user really added Description field

data/core.yaml

@@ -934,6 +934,7 @@ en:
       choose: "**Choose Playground from the list.**"
       add_field: "This playground doesn't have an official name, so we won't add anything in the Name field.  Instead let's add some additional details about the playground to the Description field. **Open the Add Field list.**"
       choose_field: "**Choose Description from the list.**"
+      retry_add_field: "You didn't select the Description field.  Let's try again."
       describe: "**Add a description, then click the {button} button to close the feature editor.**"
       play: "Good job! Try drawing a few more areas. Explore the presets and see what other kinds of areas you can add to OpenStreetMap. **When you are ready to continue to the next chapter, click '{next}'.**"
     lines:

dist/locales/en.json

@@ -796,6 +796,7 @@
                 "choose": "**Choose Playground from the list.**",
                 "add_field": "This playground doesn't have an official name, so we won't add anything in the Name field.  Instead let's add some additional details about the playground to the Description field. **Open the Add Field list.**",
                 "choose_field": "**Choose Description from the list.**",
+                "retry_add_field": "You didn't select the Description field.  Let's try again.",
                 "describe": "**Add a description, then click the {button} button to close the feature editor.**",
                 "play": "Good job! Try drawing a few more areas. Explore the presets and see what other kinds of areas you can add to OpenStreetMap. **When you are ready to continue to the next chapter, click '{next}'.**"
             },

modules/ui/intro/area.js

@@ -186,7 +186,12 @@ export function uiIntroArea(context, reveal) {
 
         d3.select('div.combobox')
             .on('click.intro', function() {
-                continueTo(addDescription);
+                timeout(function() {
+                    if (d3.select('.form-field-description').empty())
+                        continueTo(retryChooseDescription);
+                    else
+                        continueTo(addDescription);
+                }, 100);
             });
 
         function continueTo(nextStep) {
@@ -213,6 +218,22 @@ export function uiIntroArea(context, reveal) {
     }
 
 
+    function retryChooseDescription() {
+        context.on('exit.intro', function() {
+            return chapter.restart();
+        });
+
+        reveal('.entity-editor-pane', t('intro.areas.retry_add_field'), {
+            buttonText: t('intro.ok'),
+            buttonCallback: function() { continueTo(clickAddField); }
+        });
+
+        function continueTo(nextStep) {
+            nextStep();
+        }
+    }
+
+
     function play() {
         dispatch.call('done');
         reveal('.intro-nav-wrap .chapter-line',