fix(alerts): check for null description before performing find and replace

Author: landonreed

lib/alerts/reducers/alerts.js

@@ -100,7 +100,9 @@ const alerts = (state = defaultState, action) => {
           const alert = {
             id: rtdAlert.Id,
             title: rtdAlert.HeaderText,
-            description: rtdAlert.DescriptionText.replace(/(\r\n)/g, '\n'), // RTD server sends back two-char new lines, which can mess up character limit counts
+            // RTD server sends back two-char new lines, which can mess up character limit counts
+            // Here, we replace any of those occurrences with a single new line char.
+            description: rtdAlert.DescriptionText && rtdAlert.DescriptionText.replace(/(\r\n)/g, '\n'),
             cause: rtdAlert.Cause,
             effect: rtdAlert.Effect,
             editedBy: rtdAlert.EditedBy,