replace error handling in restapi helpers
add test error for asserting on common errors
replace error handling in call logs
make error message in assertion optional
add helper for checking if a resource in a url exists
cleanup user cti profile tests

- remove useless error checking tests
- make tests a bit more easier to read
replace error checking and cleanup unit tests in line extension
replace error checking and cleanup unit tests in line extension collection
replace error checking and cleanup unit tests in queue members
replace error checking and cleanup unit tests in user cti profile
replace error checking and cleanup unit tests in user line
replace error checking and cleanup unit tests in user voicemail
remove tests treating errors

 - moved to the new testing API
add missing argument to error message
rename error handler
reformat error messages in mooltiparse

use same style as in DAO
check that extension exists before dissociating
check that line exists before dissociating