Introduced new missing manager exception. Added some try-catches to the platform to ensure it doesn't crash when a manager doesn't exist.
git-svn-id: https://svn.cs.york.ac.uk/svn/ossmeter/Software/source@998 1b171192-1bc4-4300-84b6-1b6fde2e8ce3
Authored by: jw@CS.YORK.AC.UK 2014-03-17
Parent(s): [9b05bc]
Child(ren): [254517]