How to throw exception if input params is invalid in Django Template
Solution 1:
In Django<=1.9
TEMPLATE_STRING_IF_INVALID = 'DEBUG WARNING: undefined template variable [%s] not found'
in your settings.py.
In Django>=1.10
string_if_invalid = 'DEBUG WARNING: undefined template variable [%s] not found'
Also check this link about invalid template variables
And this link about django backend template engine