Fixes #629 by expecting NoSuchElementException (#630)
Fixes #629 by expecting NoSuchElementException (#630)

* Fixes #629 by expecting NoSuchElementException

Empty expect are not coding practices. The deselect_by_value
and the deselect_by_visible_text raises NoSuchElementException if it
can not deselect the items.

robotframework/SeleniumLibrary,SergiuTudos/Selenium2Library,SergiuTudos/Selenium2Library,HelioGuilherme66/robotframework-selenium2library,emanlove/robotframework-selenium2library,rtomac/robotframework-selenium2library,robotframework/SeleniumLibrary,Gaurang033/Selenium2Library,HelioGuilherme66/robotframework-selenium2library,rtomac/robotframework-selenium2library,emanlove/robotframework-selenium2library,Gaurang033/Selenium2Library,rtomac/robotframework-selenium2library,robotframework/SeleniumLibrary,emanlove/robotframework-selenium2library,SergiuTudos/Selenium2Library,HelioGuilherme66/robotframework-selenium2library,Gaurang033/Selenium2Library