Fixed out of boundary exception

When network request has been removed, and the
data network does not have any network request
attached, do not schedule retry.

Fix: 215502239
Fix: 227590694
Test: atest DataNetworkControllerTest
Merged-In: Icc019fcb4119b0e2b43faa80d5e16d01324409c8
Change-Id: Icc019fcb4119b0e2b43faa80d5e16d01324409c8