private Sdk getSelectedSdk() {
    if (isUseModuleSdk()) {
      Module module = getModule();
      return module == null ? null : ModuleRootManager.getInstance(module).getSdk();
    }
    Sdk sdk = (Sdk)content.interpreterComboBox.getSelectedItem();
    if (sdk == null) {
      return ProjectRootManager.getInstance(myProject).getProjectSdk();
    }
    return sdk;
  }
private Sdk getSelectedSdk()