@Berdir there are cases were site is installed in automated scripts (travis b...

@Berdir there are cases were site is installed in automated scripts (travis build / deployment scripts). For such cases, it is important to make sure install of module works without a FATAL error.

Just a suggestion - we can have nothing in hook_install() of the module considering the fact that it is for update only but having code which throws FATAL error is not good IMO.