Poor error reporting in CSV import when directory is invalid

Customer reports getting this exception during CSV import. Not sure whether it is CSV file or config file.

• javax.servlet.error.message : java.io.FileNotFoundException: d:\tmp (Access is denied)<p><small><small><pre>com.atlassian.jira.imports.csv.CsvImportException: java.io.FileNotFoundException: d:\tmp (Access is denied) at com.atlassian.jira.imports.csv.MindProdCsvProvider.startSession(MindProdCsvProvider.java:58) at com.atlassian.jira.imports.csv.CsvConfigBean.<init>(CsvConfigBean.java:161) at com.atlassian.jira.imports.csv.CsvConfigBean.createNewConfigBean(CsvConfigBean.java:905) at com.atlassian.jira.web.action.util.csv.ConfigureCsvMapping.doStart(ConfigureCsvMapping.java:104) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at webwork.util.InjectionUtils$DefaultInjectionImpl.invoke(InjectionUtils.java:61) at webwork.util.InjectionUtils.invoke(InjectionUtils.java:52) at webwork.action.ActionSupport.invokeCommand(ActionSupport.java:417) at webwork.action.ActionSupport.execute(ActionSupport.java:146) at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:46) at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:131) at com.atlassian.jira.web.dispatcher.JiraServletDispatcher.service(JiraServletDispatcher.java:186) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at