Fix parseNetworkSuggestionsMap put a null object into the map

Create perAppInfo if suggestion is empty.
If upgrade from Q with empty suggestion, setUid when add suggestions.

Bug: 146518087
Test: atest com.android.wifi.server
Test: acts WifiNetworkSuggestionTest
Change-Id: I25af894b3cedbf5a5b5cabde63c6d5cf74d686ae
3 files changed
tree: 6186128b7310963485d713e5430ea88bebdc1d6d
  1. apex/
  2. service/
  3. PREUPLOAD.cfg