normalizers: Fix crash in parseTuples when tuples is empty

CHANGELOG.md

@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Changed
 
 ### Fixed
+- Crash when parsing tuples in Settings
 
 ## [2.4.0] - 2021-08-01
 

src/store/modules/normalizers.js

@@ -56,6 +56,10 @@ export const parseNonTuples = (key, value) => {
 }
 // REFACTOR
 export const parseTuples = (tuples, key) => {
+  if (!tuples.reduce) {
+    console.warn('Got empty tuples with key:', key)
+    return null
+  }
   return tuples.reduce((accum, item) => {
     if (key === ':rate_limit' ||
       (key === 'Pleroma.Web.Endpoint.MetricsExporter' && item.tuple[0] === ':auth')) {