Merge pull request #2398 from influxdata/bugfix/hosts-page-error-2255

Fix Hosts Page Apps Tag Parsing

CHANGELOG.md

@@ -12,6 +12,7 @@
 1. [#2327](https://github.com/influxdata/chronograf/pull/2327): Visualize CREATE/DELETE queries with Table view in Data Explorer
 1. [#2329](https://github.com/influxdata/chronograf/pull/2329): Include tag values alongside measurement name in Data Explorer result tabs
 1. [#2386](https://github.com/influxdata/chronograf/pull/2386): Fix queries that include regex, numbers and wildcard
+1. [#2398](https://github.com/influxdata/chronograf/pull/2398): Fix apps on hosts page from parsing tags with null values
 1. [#2408](https://github.com/influxdata/chronograf/pull/2408): Fix updated Dashboard names not updating dashboard list
 
 ### Features

ui/src/hosts/apis/index.js

@@ -196,17 +196,21 @@ function parseSeries(series) {
   function parseTag(s, obj) {
     const match = tag.exec(s)
 
-    const kv = match[0]
-    const key = match[1]
-    const value = match[2]
-
-    if (key) {
-      if (!obj.tags) {
-        obj.tags = {}
+    if (match) {
+      const kv = match[0]
+      const key = match[1]
+      const value = match[2]
+
+      if (key) {
+        if (!obj.tags) {
+          obj.tags = {}
+        }
+        obj.tags[key] = value
       }
-      obj.tags[key] = value
+      return s.slice(match.index + kv.length)
     }
-    return s.slice(match.index + kv.length)
+
+    return ''
   }
 
   let workStr = series.slice()