Fixed Save logic so it's not triggered when field was not autofilled.

Test: atest CtsAutoFillServiceTestCases:VirtualContainerActivityTest#testSaveNotShown_initialValues_noUserInput_serviceDatasets\
CtsAutoFillServiceTestCases:VirtualContainerActivityCompatModeTest#testSaveNotShown_initialValues_noUserInput_serviceDatasets
Test: atest CtsAutoFillServiceTestCases
Test: manual verification with Chrome in compat mode

Fixes: 75333153

Change-Id: I344755ce0f5937180b4647fa47269eca5c93c980
1 file changed