From b1956def917e9e2d26f17487ded4344719060099 Mon Sep 17 00:00:00 2001
From: Simon Brooke <simon@journeyman.cc>
Date: Wed, 29 Mar 2017 06:14:15 +0100
Subject: [PATCH 1/2] #37: never set :page to nil

---
 src/cljs/youyesyet/handlers.cljs | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/cljs/youyesyet/handlers.cljs b/src/cljs/youyesyet/handlers.cljs
index ee31a59..4c9b665 100644
--- a/src/cljs/youyesyet/handlers.cljs
+++ b/src/cljs/youyesyet/handlers.cljs
@@ -34,9 +34,10 @@
 
 
 (reg-event-db
-  :set-active-page
-  (fn [db [_ page]]
-    (assoc db :page page)))
+ :set-active-page
+ (fn [db [_ page]]
+   (if page
+     (assoc db :page page))))
 
 
 (reg-event-db

From 72b4f058ed46c04275cfe76e3e7d0a589b71508e Mon Sep 17 00:00:00 2001
From: Simon Brooke <simon@journeyman.cc>
Date: Wed, 29 Mar 2017 06:40:04 +0100
Subject: [PATCH 2/2] #37: Well, THAT was easy!

Protective wrapper around :page rendering so that the initial, transient null value doesn't get rendered!
---
 src/cljs/youyesyet/core.cljs | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/cljs/youyesyet/core.cljs b/src/cljs/youyesyet/core.cljs
index fb5c009..69f23aa 100644
--- a/src/cljs/youyesyet/core.cljs
+++ b/src/cljs/youyesyet/core.cljs
@@ -71,11 +71,16 @@
    :map #'map-page
    })
 
-(defn page []
+(defn page
+  "Render the single page of the app, taking the current panel from
+  the :page key in the state map."
+  []
   [:div
-  [:header
-   [ui/navbar]]
-   [(pages @(rf/subscribe [:page]))]])
+   [:header
+    [ui/navbar]]
+   (let [content (pages @(rf/subscribe [:page]))]
+     (if content [content]
+       [:div.error (str "No content in page " :page)]))])
 
 ;; -------------------------
 ;; Routes