Merge pull request #9380 from jibees/9068-bulk-product-update-creating-new-on_demand-variant

Admin, Products list: fix variant creation when unit is not well formatted and on_demand is checked or on_hand is filled

app/assets/javascripts/admin/utils/services/errors_parser.js.coffee

@@ -5,15 +5,16 @@ angular.module("admin.utils").factory "ErrorsParser", ->
       return defaultContent unless errors?
 
       errorsString = ""
-      if errors.length > 0
+      if Array.isArray(errors)
         # it is an array of errors
         errorsString = errors.join("\n") + "\n"
-      else
+      else if typeof errors == "object"
         # it is a hash of errors
         keys = Object.keys(errors)
         for key in keys
           errorsString += errors[key].join("\n") + "\n"
-
+      else # string
+        errorsString = errors
       this.defaultIfEmpty(errorsString, defaultContent)
 
     defaultIfEmpty: (content, defaultContent) =>