Restore Dewey Decimals message

The "no results found" message was showing instead due to some tricky
state management stuff.

js/app.js

@@ -39,7 +39,7 @@ var App = React.createClass({
     return {
       viewingPage: viewingPage,
       drawerOpen: drawerOpenRaw !== null ? JSON.parse(drawerOpenRaw) : true,
-      pageArgs: val,
+      pageArgs: typeof val !== 'undefined' ? val : null,
       errorInfo: null,
       modal: null,
       startNotice: null,
@@ -193,7 +193,7 @@ var App = React.createClass({
         return <PublishPage />;
       case 'discover':
       default:
-        return <DiscoverPage query={this.state.pageArgs} />;
+        return <DiscoverPage {... this.state.pageArgs !== null ? {query: this.state.pageArgs} : {} } />;
     }
   },
   render: function() {

js/page/discover.js

@@ -268,20 +268,27 @@ var DiscoverPage = React.createClass({
   componentDidUpdate: function() {
     if (this.props.query != this.state.query)
     {
-      this.handleSearchChanged();
+      this.handleSearchChanged(this.props.query);
     }
   },
 
-  handleSearchChanged: function() {
-    this.setState({
-      searching: true,
-      query: this.props.query,
-    });
-
-    lighthouse.search(this.props.query, this.searchCallback);
+  componentWillReceiveProps: function(nextProps, nextState) {
+    if (nextProps.query != nextState.query)
+    {
+      this.handleSearchChanged(nextProps.query);
+    }
   },
 
-  componentDidMount: function() {
+  handleSearchChanged: function(query) {
+    this.setState({
+      searching: true,
+      query: query,
+    });
+
+    lighthouse.search(query, this.searchCallback);
+  },
+
+  componentWillMount: function() {
     document.title = "Discover";
     if (this.props.query) {
       // Rendering with a query already typed
@@ -293,7 +300,7 @@ var DiscoverPage = React.createClass({
     return {
       results: [],
       query: this.props.query,
-      searching: this.props.query && this.props.query.length > 0
+      searching: ('query' in this.props) && (this.props.query.length > 0)
     };
   },