docs: private Attributes getMainAttributes() {
          if (null == mainAttributes) {
              mainAttributes = getJarMainAttributes(pluginJar);
              String pluginName = mainAttributes.getValue(RUNDECK_PLUGIN_NAME);
              if(pluginName == null) {
                  //Fallback to something that will rarely change
                  //This is not ideal, but old plugins do not always have a name
                  //set in the attributes
                  pluginName = mainAttributes.getValue(RUNDECK_PLUGIN_CLASSNAMES);
              }
              pluginId = PluginUtils.generateShaIdFromName(pluginName);
          }
          return mainAttributes;
      }