[dashboard] Apply code review suggestions

Author: jankeromnes

components/dashboard/src/App.tsx

@@ -48,11 +48,12 @@ function App() {
         window.location.reload(true);
       }
     }, false);
-    const hash = window.location.hash.replace(/^[#/]+/, '');
+
+    const hash = getURLHash();
     if (window.location.pathname === '/' && hash !== '') {
       return <CreateWorkspace contextUrl={hash} gitpodService={gitpodService}/>;
     }
-    if (/\/start\/?/.test(window.location.pathname)) {
+    if (/\/start\/?/.test(window.location.pathname) && hash !== '') {
       return <StartWorkspace workspaceId={hash} gitpodService={gitpodService}/>;
     }
 
@@ -85,6 +86,10 @@ function App() {
     );
 }
 
+function getURLHash () {
+  return window.location.hash.replace(/^[#/]+/, '');
+}
+
 const renderMenu = () => (
     <Menu left={[
         {