Fixed bug: Invalid API keys are validated as correct.

app/controllers/import_otrs_controller.rb

@@ -22,9 +22,7 @@ class ImportOtrsController < ApplicationController
       'Connection refused'                                        => 'Connection refused!',
     }
 
-    url_parts = params[:url].split(';')
-
-    response = UserAgent.request( url_parts[0] )
+    response = UserAgent.request( params[:url] )
 
     if !response.success? && response.code.to_s !~ /^40.$/
       message_human = ''
@@ -44,6 +42,11 @@ class ImportOtrsController < ApplicationController
     result = {}
     if response.body =~ /zammad migrator/
 
+      migrator_response = JSON.parse(response.body)
+
+      if migrator_response['Success'] == 1
+
+        url_parts = params[:url].split(';')
         key_parts = url_parts[1].split('=')
 
         Setting.set('import_backend', 'otrs')
@@ -54,6 +57,12 @@ class ImportOtrsController < ApplicationController
           result: 'ok',
           url: params[:url],
         }
+      else
+        result = {
+          result: 'invalid',
+          message_human: migrator_response['Error']
+        }
+      end
     elsif response.body =~ /(otrs\sag|otrs\.com|otrs\.org)/i
       result = {
         result: 'invalid',