Created attachment 1534106 [details]
some widgets loosing content when changing user's timezone

Description of problem:
   Content of some widget disappears when changing user's Timezone 

Version-Release number of selected component (if applicable):
 Issue replicated on master branch, but I think it exists for some time

How reproducible:
100%


Steps to Reproduce:
1. make sure that widgets "EVM: Recently Discovered Hosts" or "Top CPU Consumers (weekly)" show some data in "Cloud Intel" -> "Dashboard"
2. change Timezone for logged-in user: "My Settings" -> "Display Settings: Time Zone"
3. go to "Cloud Intel" -> "Dashboard"

Actual results:
  "No data found" in above widgets
  (screen shot attached)

Expected results:
   widgets should have data