Downloading observations for client in Step 5: Add Concept(s)

Testing Steps:

1. Open mUzima then login
2. In Setup screen, select Advanced Setup > Next
3. Perform sequentially from step 1 to step 4
4. In Step 5, select any concept > Next

Observe: Pop up "Downloading observations and encounters" still show when download is completed. After a long time waiting, back to home screen. When enter app again, app crashes.

Expected result: App should move to step 6 after finish downloading, no crashes occurred

Note: Log files https://www.dropbox.com/sh/64d024vju7j70rk/AACOwuFcebRkGA6TH65zqbH_a?dl=0