Data table only shows attributes if at least one entity on the first page has a value for it

1) Create a new workspace
2) Upload the following participants loadfile (also attached):

entity:participant_id   attr1   attr2
01  value01 
02      
03      
04      
05      
06      
07      
08      
09      
10      
11      
12      
13      
14      
15      
16      
17      
18      
19      
20      
21      value21

Note that the default page size in the UI is 20.

3) Now go to the data tab and view the participants. Note that only attr1 is shown, even if we go to the next page where participant 21 is (see screenshot). The attribute is still there, as FISSFC can verify:

timdef@wmc82-d41:~/src/fiss$ fissfc attr_get -p broad-firecloud-testing -w ui_bug -t participant
participant_id  attr1   attr2
01  value01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21      value21

And even more confusingly, using the search bar returns participant21, apparently for no reason (second screenshot). It is probably worth it for the workspaces data model to maintain a set of all the attributes in it's back pocket (with an API endpoint as well) so it isn't dependent on scanning through the entire set of entities to find out which attributes exist.