Concerning Ametys.plugins.cms.help.HelpTool#openTool, I think if no tool is opened and no tooltip is opened, you will get an NPE here

			if (qt && qt.isVisible())
			{
				helpId = qt.activeTarget.helpId;
			}
			else
			{
				ft = Ametys.tool.ToolsManager.getFocusedTool();
				helpId = ft.getToolHelpId();
			}

even if the end of the code can handle a null helpId