fix(docz-core): prevent crash on delete entry

packages/docz-core/templates/index.tpl.js

@@ -1,6 +1,8 @@
 <% if (!isProd) {%>import 'webpack-serve-overlay'<%}%>
 import React from 'react'
 import ReactDOM from 'react-dom'
+
+import { imports } from './imports'
 import Root from './root'
 
 const _onPreRenders = [<% if (onPreRenders) {%><%- onPreRenders %><%}%>]
@@ -12,7 +14,11 @@ const onPostRender = () => _onPostRenders.forEach(f => f && f())
 const root = document.querySelector('#root')
 const render = (Component = Root) => {
   onPreRender()
-  ReactDOM.render(<Component />, root, onPostRender)
+  ReactDOM.render(<Component imports={imports} />, root, onPostRender)
+}
+
+if (module.hot) {
+  module.hot.accept('./imports', () => render(Root))
 }
 
 render(Root)

packages/docz-core/templates/root.tpl.js

@@ -1,13 +1,11 @@
 import React from 'react'
 import { hot } from 'react-hot-loader'
 import Theme from '<%- theme %>'
-
-import { imports } from './imports'
 import db from './db.json'
 
 <% if (wrapper) {%>import Wrapper from '<%- wrapper %>'<%}%>
 
-const Root = () => (
+const Root = ({ imports }) => (
   <Theme
     db={db}
     imports={imports}

packages/docz/src/components/DocPreview.tsx

@@ -98,20 +98,22 @@ export const DocPreview: SFC<DocPreviewProps> = ({
                     const entry = entries[path]
 
                     return (
-                      <Route
-                        exact
-                        key={entry.id}
-                        path={entry.route}
-                        render={props => (
-                          <AsyncRoute
-                            {...props}
-                            path={path}
-                            entries={entries}
-                            imports={imports}
-                            components={components}
-                          />
-                        )}
-                      />
+                      entry && (
+                        <Route
+                          exact
+                          key={entry.id}
+                          path={entry.route}
+                          render={props => (
+                            <AsyncRoute
+                              {...props}
+                              path={path}
+                              entries={entries}
+                              imports={imports}
+                              components={components}
+                            />
+                          )}
+                        />
+                      )
                     )
                   })}
                   {NotFound && <Route component={NotFound} />}