Checking for floats as well as the same thing will probably happen.
Test CustomFieldHelper.formatCustomFieldValue

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Handling garbabe strings in custom field int/float parsing.
Merge pull request #1113 from opf/bug-5858-timelines-custom-fields-null-if-empty

Showing empty string for null int and float custom value in timelines.