Fixed NPE in JetRunConfigurationEditor.resetEditorFrom

#EA-34897 fixed

.idea/runConfigurations/IDEA.xml

@@ -17,6 +17,9 @@
       <option name="TRANSPORT" value="0" />
       <option name="LOCAL" value="true" />
     </RunnerSettings>
+    <RunnerSettings RunnerId="Profile ">
+      <option name="myExternalizedOptions" />
+    </RunnerSettings>
     <RunnerSettings RunnerId="Run" />
     <ConfigurationWrapper RunnerId="Debug" />
     <ConfigurationWrapper RunnerId="Run" />

idea/src/org/jetbrains/jet/plugin/run/JetRunConfigurationEditor.java

@@ -55,7 +55,7 @@ public class JetRunConfigurationEditor extends SettingsEditor<JetRunConfiguratio
     @Override
     protected void resetEditorFrom(JetRunConfiguration configuration) {
         myCommonProgramParameters.reset(configuration);
-        myMainClassField.setText(configuration.MAIN_CLASS_NAME.getFqName());
+        myMainClassField.setText(configuration.MAIN_CLASS_NAME == null ? null : configuration.MAIN_CLASS_NAME.getFqName());
         myModuleSelector.reset(configuration);
     }