Catch exception when attempting to create GitHub installation token

Author: zackgalbreath

app/cdash/app/Lib/Repository/GitHub.php

@@ -147,7 +147,12 @@ public function authenticate($required = true)
 
         $this->apiClient->authenticate($jwt, null, GitHubClient::AUTH_JWT);
 
-        $token = $this->apiClient->api('apps')->createInstallationToken($this->installationId);
+        try {
+            $token = $this->apiClient->api('apps')->createInstallationToken($this->installationId);
+        } catch (\Exception $e) {
+            \Log::error($e->getMessage());
+            return false;
+        }
         if ($token) {
             $this->apiClient->authenticate($token['token'], null, GitHubClient::AUTH_HTTP_TOKEN);
         }