> The test
>   if( template )
> makes only sense, if you can be sure that uninitialzed values
> will definitelky be NULL.

You must have missed the g_return_val_if_fail (! template ||
GIMP_IS_CONTEXT (template), NULL) .

It checks if template is NULL or a pointer to a valid GimpContext. If
template is some random non-NULL value, the test will fail and a
warning message will be printed. Such warning messages indicate a
programmer error and should be dealt with during development.

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