Fix php7.2 notices on trying to count null

[eileenmcnaughton]

Overview

Fix warning messages in php 7.2 when trying to count NULL

Before

After

Technical Details

I just fixed all the places where these 2 smarty vars are counted as they are often NULL. There are a couple of other similar patterns but I don't know if they are potentially null so not addressing pro-actively

Comments

@seamuslee001 another one

[civibot]

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[monishdeb]

Agree with the fix. Tested on local and didn't cause unintended behaivour. Thanks!