commit.author can be null (#89)

* commit.author can be null

Fixes #86

* correct key

Author: Peter Bengtsson

src/DeployPage.js

@@ -288,7 +288,11 @@ class DeployTable extends React.Component {
         }
       }
 
-      if (commit.author.login === BORS_LOGIN && commit.author.type === 'Bot') {
+      if (
+        commit.author &&
+        commit.author.login === BORS_LOGIN &&
+        commit.author.type === 'Bot'
+      ) {
         hasBors = true;
       } else if (borsMode) {
         continue;
@@ -430,7 +434,10 @@ class CommitDetails extends React.Component {
   render() {
     let { commit, author, tag, html_url, borsMode, owner, repo } = this.props;
 
-    let involvedUsers = [author];
+    let involvedUsers = [];
+    if (author) {
+      involvedUsers.push(author);
+    }
 
     let title;
     if (borsMode && author.login === BORS_LOGIN && author.type === 'Bot') {
@@ -656,7 +663,7 @@ class Culprits extends React.PureComponent {
                   <span className="on-prefix">On</span> {group.name}
                 </h4>
                 {group.users.map(([role, user]) => (
-                  <div key={`${role}:${user}`} className="media">
+                  <div key={`${role}:${user.login}`} className="media">
                     <a href={user.html_url}>
                       <img
                         src={user.avatar_url}