Merge branch 'truncate-null' into 'master'

Handle null or undefined values in truncate mixin

Closes #1037

See merge request teklia/arkindex/frontend!1329

src/mixins.js

@@ -2,18 +2,17 @@ import { TRUNCATE_LENGTHS } from './config'
 import { ensureArray } from './helpers'
 
 const truncateFilter = maxLength => text => {
-  return text.length > maxLength ? text.slice(0, maxLength) + '…' : text
-}
-
-const truncateFilters = {
-  truncateSelect: truncateFilter(TRUNCATE_LENGTHS.select),
-  truncateLong: truncateFilter(TRUNCATE_LENGTHS.long),
-  truncateShort: truncateFilter(TRUNCATE_LENGTHS.short),
-  truncateNotification: truncateFilter(TRUNCATE_LENGTHS.notification)
+  if (text?.length > maxLength) return text.slice(0, maxLength) + '…'
+  return text ?? ''
 }
 
 export const truncateMixin = {
-  methods: truncateFilters
+  methods: {
+    truncateSelect: truncateFilter(TRUNCATE_LENGTHS.select),
+    truncateLong: truncateFilter(TRUNCATE_LENGTHS.long),
+    truncateShort: truncateFilter(TRUNCATE_LENGTHS.short),
+    truncateNotification: truncateFilter(TRUNCATE_LENGTHS.notification)
+  }
 }
 
 const corporaFilters = {