fixed error log spam of: uninitialized value in string eq at /WebApplication.pm line 132
fixed error log spam of: uninitialized value in exists at /Analysis.pm line 1354
fixed error log spam of: uninitialized value  in string at upload.cgi line 384
Merge pull request #520 from teharrison/develop

remove unwanted error log messages
Merge branch 'develop' of github.com:MG-RAST/MG-RAST
fixed uninitialized string warnings