Whitespace, semicolon--
Fix for #473
removed white spaces in blank lines
replaced all tabs with 4 spaces
conforming to non-existent coding conventions with try-catch block
Merge pull request #521 from aodn/white_spaces_FTW

White spaces ftw
Code review whitespace changes
try/catch consistency, and also 4-space indentation.
Second time lucky.
removed white spaces in end of lines
Merge pull request #522 from aodn/catch_consistency

try/catch consistency, and also 4-space indentation.
Merge pull request #523 from aodn/white_space_end_of_line

removed white spaces in end of lines
Whitespace, semicolon--
Fix for #473
Code review whitespace changes
More refactoring based on Jon's review
Merge from master
Updating unit tests for FilterPanel
Merge pull request #519 from aodn/issue-473

Issue 473
Changes for #515