Merge pull request #80 from serilog/adamchester/check-empty-object-readme

Add a recipie for checking if an object is empty

Author: nblumhardt

README.md

@@ -279,6 +279,12 @@ Substring(SourceContext, LastIndexOf(SourceContext, '.') + 1)
 
 This expression takes advantage of `LastIndexOf()` returning -1 when no `.` character appears in `SourceContext`, to yield a `startIndex` of 0 in that case.
 
+**Write not-referenced context properties, only if there any:**
+
+```
+{#if rest(true) <> {}} <Context: {rest(true)}>{#end}
+```
+
 **Access a property with a non-identifier name:**
 
 ```