Improving error message of new clicks

[noubar]

I am suggesting an improvement for recently implemented keywords of #147
The error messages of the keywords can be better as follow:

distinguish between two cases inside the keyword:
case 1) if the click_element is not there
case 2) or the open_element could not be oppened after clicking on click_element

Currently the error message is the same for both cases, distinguish between both to increase the understandability