Added delivery test to README file.

generators/block/templates/README.md

@@ -116,6 +116,18 @@ Check the [Video Guide](https://www.loom.com/share/1c707a4ea14e48b7a35a49d7b0a6f
 
 Use development toolbar to switch between data sources.
 
+### Conditional Statements
+Make sure the data is available in Handlebars template.   
+If there is a chance that some data/property will be missing - wrap the HTML layout with conditional verification:
+
+Example:   
+Render the link only if URL exists
+```
+{{#if link_cta_url }}
+<a href="{{link_cta_url}}">Click Here</a>
+{{ endif }}
+```
+
 ### Hover/Focus States ✔️
 
 Make sure all "clickable" elements have `&:hover` & `&:focus` states in CSS rules.