Prevent race conditions on round loading

opentech/static_src/src/app/src/containers/ByRoundListing.js

@@ -58,8 +58,9 @@ class ByRoundListing extends React.Component {
 
     prepareOrder = () => {
         const { isLoading, rounds, submissions } = this.props;
-        if (isLoading)
+        if (isLoading || Object.entries(rounds).length === 0) {
             return []
+        }
         return submissions.sort((a, b) => a.id - b.id )
                           .map(submission => submission.round)
                           .filter((round, index, arr) => arr.indexOf(round) === index)

opentech/static_src/src/app/src/containers/CurrentSubmissionDisplay.js

@@ -9,6 +9,7 @@ import {
     getCurrentSubmissionID,
 } from '@selectors/submissions'
 import SubmissionDisplay from '@components/SubmissionDisplay';
+import LoadingPanel from '@components/LoadingPanel'
 import MessagesList from '@components/MessagesList'
 import MessageBar from '@components/MessageBar'
 
@@ -66,7 +67,7 @@ const  CurrentSubmissionDisplay = props => {
     }
 
     if ( !localSubmission ) {
-        return <p>Loading</p>
+        return <LoadingPanel />
     }
 
     const renderUpdatedMessage = () =>{