[automerger] Add check preventing div0 issue am: 27e47ce3c3 am: 357017a262 am: fef8617324 am: a7d57f7a14 am: 19d80c34be am: 96fa1d1842 am: 1ed02297a9

Change-Id: Ibc325d1a02e5ae54cd119b02a673d1d4a0f07ee5