You can select wether to run Template Engine in strict reference mode. The general intent of strict reference mode is to make Template Engine behave more strictly in cases that are undefined or ambiguous. In such cases Template Engine will throw an exception, and not write any output.
For example, if the variable $country is not defined using a
#set directive, Template Engine will throw an exception if strict reference mode is enabled. If strict reference mode is disabled in this case, Template Engine will write
$country as plain text to the output.