DngCreator: Avoid moving absent tag entries

Tags 'TAG_OPCODELIST2' and 'TAG_OPCODELIST3' could be
absent from the main image IFD. Check for their presence
first before moving in the thumbnail sub IFD.

Bug: 112526551
Test: Camera CTS
Change-Id: I7039a533777ca95524d4c7d586ca4b40739cd2e5