Issue on context menu and object refresh upon saving

[euniceremoquillo]

Context menu does not close after editing a host/service. This occurs regardless of whether the user apply changes or not in a host or service in nagvis as long as the user saves the changes during modify object.
After modifying the object, when the refresh status option is executed twice a javascript error will popup.
"Javascript error occured: Uncaught TypeError: Cannot read properties of null (reading 'obj') [server]/nagvis/frontend/nagvis-js/js/ElementContext.js?v=1.9.34(49)"

Steps to replicate:

1. Create a Regular Map or Edit an existing regular map.
2. Create a host/service.
3. Unlock the created host/service.
4. Right click on it and select Modify Object.
5. Click on save.
6. Right click on the host/service which was selected for Modify object (The context menu does not close upon this right click) and select "Refresh status".
7. After 1 attempt of "Refresh status" (Object does not refresh and the context menu is still displayed), then select it for the 2nd time (Javascript error pops up).

[euniceremoquillo]

We have suggested fixes on pull request #333