Check ifIndex for deleted ports [OBSERVIUM-407].


git-svn-id: http://observium.org/svn/observer/trunk@4215 61d68cd4-352d-0410-923a-c4978735b2b8
fix substr -> truncate for weird entity descr on alert page


git-svn-id: http://observium.org/svn/observer/trunk@4216 61d68cd4-352d-0410-923a-c4978735b2b8
fix button options on /alerts/


git-svn-id: http://observium.org/svn/observer/trunk@4217 61d68cd4-352d-0410-923a-c4978735b2b8