Inconsistency in rawData->pageData

[ash]

Hi

I use wptmonitor that apparently uses raw page data of representative run of the test. It requires column names in the first line of the file but since some time they are present only for some test results

no headers example: http://www.webpagetest.org/results/15/02..._IEWPG.txt (http://www.webpagetest.org/result/150226...1b69a5595/)

example with headers: http://www.webpagetest.org/results/15/02..._IEWPG.txt (http://www.webpagetest.org/result/150226...30f785216/)

It seems that headers are present for UrlBlaster agents only.