"java.lang.IllegalArgumentException: Invalid module key specified" when creating a custom field without selecting a searcher

Steps to produce

1. Go to custom fields.
2. Create a new custom field of type 'Number Field'.
3. At the Search Template, select None.
4. click on Finish, following error should appear:

   java.lang.IllegalArgumentException: Invalid module key specified: 
   	at com.atlassian.plugin.ModuleCompleteKey.<init>(ModuleCompleteKey.java:40)
   	at com.atlassian.plugin.ModuleCompleteKey.<init>(ModuleCompleteKey.java:24)
   	at com.atlassian.plugin.manager.DefaultPluginManager.getEnabledPluginModule(DefaultPluginManager.java:990)
   	at com.atlassian.jira.issue.managers.DefaultCustomFieldManager.getCustomFieldSearcher(DefaultCustomFieldManager.java:262)
   	at com.atlassian.jira.bc.customfield.DefaultCustomFieldService.validateCreate(DefaultCustomFieldService.java:255)
   	at com.atlassian.jira.web.action.admin.customfields.CreateCustomField.doAddDetails(CreateCustomField.java:139)
   	at com.atlassian.jira.web.action.admin.customfields.CreateCustomField.doExecute(CreateCustomField.java:99)
   	at webwork.action.ActionSupport.execute(ActionSupport.java:165)
   	at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:82)
   	at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:39)
   	at webwork.interceptor.NestedInterceptorChain.proceed(NestedInterceptorChain.java:31)
   	at webwork.interceptor.ChainedInterceptor.intercept(ChainedInterceptor.java:16)
   	at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:35)
   	at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:221)
   	at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:150)
   	at com.atlassian.jira.web.dispatcher.JiraWebworkActionDispatcher.service(JiraWebworkActionDispatcher.java:153)
   	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.ja
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