fix(actions/versions): Fix clearing compared feed version.

lib/manager/actions/versions.js

@@ -580,14 +580,17 @@ export function ensureVersionIndexIsFetched (
   feed: Feed,
   oneBasedIndex: number
 ) {
-  return function (dispatch: dispatchFn, getState: getStateFn) {
-    const requestedVersion = feed.feedVersions && feed.feedVersions[oneBasedIndex - 1]
+  return async function (dispatch: dispatchFn, getState: getStateFn) {
     console.log('Requesting version ', oneBasedIndex)
+    if (!oneBasedIndex || oneBasedIndex < 1) return null
+
+    const requestedVersion = feed.feedVersions && feed.feedVersions[oneBasedIndex - 1]
     if (!requestedVersion) {
       if (feed.feedVersionSummaries) {
         // If the requested version has not been fetched yet, async fetch it.
         const versionId = feed.feedVersionSummaries[oneBasedIndex - 1].id
-        return dispatch(fetchFeedVersion(versionId))
+        const { payload } = await dispatch(fetchFeedVersion(versionId))
+        return payload
       }
     }
     return requestedVersion
@@ -602,7 +605,7 @@ export function setVersionIndex (
 ) {
   return async function (dispatch: dispatchFn, getState: getStateFn) {
     if (feed.feedVersionSummaries) {
-      const { payload: newActiveVersion } = await dispatch(ensureVersionIndexIsFetched(feed, oneBasedIndex))
+      const newActiveVersion = await dispatch(ensureVersionIndexIsFetched(feed, oneBasedIndex))
       dispatch(setActiveVersion(newActiveVersion))
       if (push) {
         browserHistory.push(`${isPublic ? '/public' : ''}/feed/${feed.id}/version/${oneBasedIndex}`)
@@ -623,7 +626,7 @@ export function setComparedVersion (
   oneBasedIndex: number
 ) {
   return async function (dispatch: dispatchFn, getState: getStateFn) {
-    const { payload: newComparedVersion } = await dispatch(ensureVersionIndexIsFetched(feed, oneBasedIndex))
+    const newComparedVersion = await dispatch(ensureVersionIndexIsFetched(feed, oneBasedIndex))
     // Dispatch action to set value in reducer.
     dispatch(settingComparedVersion(newComparedVersion))
     if (newComparedVersion) {